Notice the definition of the "remnant" to whom the prophecies apply has now been given. The distinction between the "gentiles" and the "remnant" are apparent here. Notice that although the gentiles will receive "much of my gospel" they will still remain identified as "Gentiles." We may refer to the restored church as "latter-day Israel" or similar terms, but the Book of Mormon vocabulary applies the term "Gentiles" to us. This is akin to the "Samaritans" many of whose blood was as Jewish as those who were exiled to Babylon and returned. Even Christ didn't acknowledge they were Jewish.
Why is it that the gentiles receive "much of my gospel" rather than the "fullness of my Gospel?" As you consider that, remember Joseph used to lament about the Saints' unwillingness to be taught new truths. Here are two of his comments:
"Paul ascended into the third heavens and he could understand the three principle rounds of Jacob's ladder - the telestial, the terrestrial, and the celestial glories or kingdoms, when Paul saw and heard things which were not lawful to utter. I could explain a hundredfold more than I ever have of the glories of the kingdoms manifested to me in the vision were I permitted and were the people ready to receive them." (DHC vol 5, p. 402.)
Joseph administered a form of endowment ceremony in Nauvoo, but told Brigham Young that he would have to finish it. Joseph initiated a few in the manner he received, but was not content with the form of the endowment. Brigham Young reported that Joseph told him, "Brother Brigham, this is not arranged right. But we have done the best we could under the circumstances in which we are placed, and I wish you to take this matter in hand and organize and systematize all these ceremonies." (See Journal of L. John Nuttal, Vol. 1, pp. 18-19, quoted in Truman G. Madsen, Joseph Smith the Prophet, Salt Lake City: Bookcraft, 1999, p. 97.)
Joseph also initiated a practice of sealing others to him, as the Patriarchal head of a dispensation. The nature of Patriarchal authority Joseph administered is different from what we currently understand or teach. Today we "seal" families together in genealogical lines based upon birth or legal adoption. Our families are tied together in what we understand was the intended purpose of Elijah's prophecy about "turning hearts of the fathers to the children, and the children to the fathers" so that the earth would not be smitten with a curse at the Lord's return. But Joseph's practice was somewhat different.
Joseph, who received the revelations on this matter, attempted to set out the manner in which the "family" will be constituted in eternity. He used Christ's comment in Matthew 19: 29 to support the idea that those who are worthy will be placed in a family organization that would be completely restructured in the resurrection. Orson Hyde later constructed a diagram of this teaching and published it in the Millennial Star Vol. 9 [15 January 1847] at pages 23-24. If you search for that on-line you can find it. You need both the diagram and the explanation to understand the teaching. It is also in The Words of Joseph Smith at page 297. Please find and read it. You need to understand that teaching, which came to Orson Hyde from Joseph Smith.
As a result of this teaching, beginning with Joseph Smith and continuing until Wilford Woodruff discontinued it, sealing for eternity was not done in family lines. It was done instead to bind those who had received the Gospel to Joseph Smith, as the Patriarchal head of this dispensation. Joseph's teaching was followed by Brigham Young, who sealed himself to Joseph as his (Joseph's) son. John D. Lee, who was executed for the Mountain Meadows Massacre, was another sealed to Brigham Young as his son. Heber Grant's mother was sealed to Joseph Smith, although his father was Jedediah Grant. As a result he (President Grant) considered himself Joseph's son. That's a side issue.
Returning to the gentile inheritance of "much of my gospel" referred to above, does it suggest that the gentiles are not/never were given generally or as a group possession of "the fullness?" Is "much of my gospel" something worth considering? Can you be certain Joseph delivered all he could or would, were the Saints willing to receive it? If it was "much" rather than "the fullness" then how does that change things?
Assuming "much of my gospel" includes (as it tells us) those things which "shall be plain and precious" then do the gentiles have enough to allow them to receive an audience with Christ as the promised Second Comforter from John's Gospel? (John 14: 18, 23.) If so, then will not Christ, along with the Holy Ghost, teach you all things needed, even if the gentiles are not in possession of the "fullness" of it all? (John 14: 26.)
This is important to understand. Nephi makes it clear how the gentiles can become adopted into the promised line and inherit a place among the chosen people who will be preserved, inherit this land, and be numbered among the house of Israel. While that jumps us ahead a bit, it is directly connected here. The first two verses of the next chapter state the following:
"And it shall come to pass, that if the Gentiles shall hearken unto the Lamb of God in that day that he shall manifest himself unto them in word, and also in power, in very deed, unto the taking away of their stumbling blocks— And harden not their hearts against the Lamb of God, they shall be numbered among the seed of thy father; yea, they shall be numbered among the house of Israel; and they shall be a blessed people upon the promised land forever; they shall be no more brought down into captivity; and the house of Israel shall no more be confounded."
If the gentiles will hearken to the Lamb, He will manifest Himself to them. What does that mean?
What does it mean to manifest Himself to us "in word?" What does it mean to manifest Himself to us "in power?" What does it mean to manifest Himself to us "in very deed?"
How would Christ manifesting Himself to you in word, in power, and in deed "take away your stumbling block?"
These are the means promised by the Book of Mormon to deliver gentiles so that they may become "a blessed people upon the promised land forever" so as to never be brought down into captivity. But to know this would require you to come into possession of the fullness. Gentile possession of the fullness does not come from group-think, or group possession of some institutional magic. It comes by the same means as salvation has come to mankind from the beginning. The Catholics don't have it and can't give it to you. No institutional church has the means to deliver the gentiles. It will come, if it comes at all, from Christ and on the same conditions as saved Joseph Smith, Paul, Alma, Moroni, Peter, Moses, Enoch, Abraham and others.
Now there is a great deal to understand about how to move from having "much of the Gospel" to having a fullness of it. But it was always planned for that final step to be taken by you with the Lord. After all, He is the gatekeeper who employs no servant between you and Him. (2 Ne. 9: 41.) This is why true servants will always point you to Him. False ones will claim they can save you, they have power to bring you to Him, they have been entrusted to open the door for you. The "gatekeeper" however does not need a doorman. Nor can He be fooled by men making pretensions to have authority while lacking any of His power. You must confront Him; or, to use His description, you must be comforted by Him.
It is clear from these verses in 1 Nephi Chapter 13 that the Lord intends to make redemption available to the gentiles, if they will receive it. But the primary means was never intended to be an institution. It was intended to be the Book of Mormon. The Book of Mormon speaks right over the heads of those who are trying to distract you from returning to Christ. You must either seek and find Him while here, or remain in this Telestial state worlds without end. His invitation is extended. He will open the gate.
Where will we find true doctrine taught? From what source does it come? Will He not, as He has promised, send true messengers to warn before He cuts off and divides asunder? If you do not understand this it is because you will not ask Him.
So, let us press on. I find this is more interesting a Gospel than I had at first imagined. Truly, such things do not enter into the heart of man. They must be revealed, or they stand unknown. Fortunately for us, the Lord has provided the Book of Mormon and sent Joseph Smith to establish a foundation from which we gentiles may derive hope.