Dispensation of the Fullness of Times

Joseph Smith: "The dispensation of the fullness of times will bring to light the things that have been revealed in all former dispensations; also other things that have not been before revealed."

In my reading of The Great Apostasy I have noted a few quotes from historians relating to the early Christian era and they mention how Pagans and Jews mocked the Christians because they didn't have temples as part of their worship.  This, of course, is a little troublesome to our Church since "we believe in the same organization that existed in the primitive Church".  We believe in the "restoration of all things" and so we usually say that we believe that our Church is the restored version of the original Church of Christ.  However, I would argue that perception is not complete and may lead us to inaccurately assume that anything not mentioned in the days of the primitive Church cannot be accepted.  This is the mentality of most protestant movements.  They recognized the obvious apostasy in the Catholic Church and so the reformers desired to return back to the original basic truths of Christianity.  This is why for them anything in addition to the Bible cannot be true, a belief which is rooted in their fear of another perversion through the evolution of doctrines that lead to Catholicism.  In the establishment of our religion, on the other hand, our main objective wasn't to simply return to what was taught in the Primitive Church (though this was necessary) it was also to progress in the direction the Primitive Church would have progressed had the apostles maintained control.  This is evident in the previous quote from Joseph Smith.  The first step of the restoration was to restore what Christ and his apostles taught.  The next step, to make this truly the dispensation of the fullness of times, is to reveal things that not even Peter or Paul revealed (that they knew of some of them* is hard to tell, but they may not have taught them publicly).  This is why Elder Talmage said that "the Restoration of the Gospel marks the inauguration of the Dispensation of the Fullness of Times" because it is a continuous process and was not 100% completed by Joseph Smith (and is still not complete), hence, "we believe all that God has revealed, all that He does now reveal, and we believe that He will yet reveal many great and important things pertaining to the Kingdom of God."  This is a possible explanation for why some say there is no proof of temples in the Primitive Church.  That being said, there are substantial evidences that the temple ordinances were known by the early apostles (see Temple and Cosmos by Hugh Nibley).  So it may just be that with an apostasy looming the apostles had to protect these ordinances from corruption by not propagating them openly.  It may also be that building a temple was an impossibility for this group of Christians persecuted even worse than our early members.  So maybe the Lord didn't require them to build a temple but allowed the administering of the ordinances on mountaintops like the example of the Mount of Transfiguration where Joseph Fielding Smith teaches that "it appears Peter, James, and John received their own endowments while on the mountain."

*The things that I am referring to here are things that may have not been revealed plainly until this dispensation.  Examples: the fullness of the temple ordinances, the three degrees of glory, the Atonement commencing in Gethsemane, the priesthood going to every worthy male, the pattern  for succession of the President of the Church, etc.