Board Thread:Questions and Answers/@comment-32948273-20160129174948/@comment-1733247-20160212012058

NintendoIsBeast wrote: Technically, he already had Asriel's. He actually didn't. That's kinda what made Flowey, well, Flowey. He's unable to feel compassion or empathy whatsoever, and it drives him to commit atrocious acts of violence just to get some sort of enjoyment out of it. When Flowey absorbs the 6 Human SOULs as well as nearly all the Monsters SOULs, he hits the 7 Human SOULs quota and becomes Asriel Dreemurr again. As a result, he progressively regains his compassion and empathy to the point where he's himself again. Even before that, he clearly has a change of plans from destroying the world to resetting it instead, which showcases the change.

But even assuming he did have his SOUL, there's a big problem still; a single Monster SOUL does not equal a single human SOUL. It takes nearly all Monster SOULs in the Underground to equal one Human SOUL, so he wouldn't be able to hit the quota and shatter the barrier anyway. As said above when he turn back into Asriel he did absorb nearly all Monster SOULs with the 6 Human SOULs, so he is capable of that power then.