Richard Bushman is a highly respected historian who probably understands the beginnings of Mormonism as well as or better than anyone else. Besides being the co-general editor of the Joseph Smith Papers, he chairs the board of directors of the Mormon Scholars Foundation. He knows early church history.
I have never equated perfection as meaning without flaw or error, rather as having flaws and errors removed. The resurrection is a free gift to all. We will all live again with immortal bodies. But the quality of our life in the hereafter depends entirely upon us and our efforts to be worthy and prepared for the greatest of all the gifts of God – eternal life.