I can't tell if this answer is too late or not, but.
I've always read this verse and wondering why it was necessary to show that the Son of Man has power to forgive sins "on earth", specifically. You see? He wasn't showing them that he had the power to forgive sins, but to forgive sins specifically on earth.
This never made sense to me until I read ...
I have heard the following argument (which is not the traditional understanding of Christianly as far as I know):
What is described here is not a physical event: i.e., not a literal physical coming out of the graves; it is rather a description of the resurrection. The resurrection here is being a spiritual revelation - which is a one Jesus speaks about for ...
@depperm gave the real answer to this question, but just for fun, here's an answer that makes recourse only to the Bible (KJV) that I think most LDS members would accept.
"29 Jesus answered and said unto them, Ye do err, not knowing the
scriptures, nor the power of God.
30 For in the resurrection they neither marry, nor are given in
marriage, but are ...