Board Thread:General Discussion/@comment-31981697-20170722123329/@comment-27136653-20180205121503

And I said to that that Asriel and Flowey aren't identical to one another. A soulless creature absorbing x souls would for sure have a different effect than two soulful creatures merging their souls. Plus, those human souls lied dormant for a long time, so maybe that too had an effect on this. Or perhaps it is as Asriel said, that the power gets split between them, meaning that the more souls are present in a system, the less power does a single one have over the whole. Which I guess is why they could so easily rebel against Flowey, but only together. And there's also no such thing as a "determination soul." That's only a thing in Glitchtale.