Board Thread:General Discussion/@comment-31981697-20170722123329/@comment-32182236-20170811120940

Tsskyx has the same reasoning as what you just said, except with Asgore himself, saying he did want to fight the other humans, and not you. (He didn't want to fight any of the humans, and Toriel exposes this)

I simply spoke my initial reasoning that lead to a lot of the side points we see now. There's no way the monsters were physically stronger back then. We don't know if monsters can gain LOVE like humans, but we do know you can't lose LOVE unless you reload to before you got it. They didn't get weaker, if anything, they got STRONGER.