Board Thread:Theories Discussion/@comment-158.148.53.131-20141115160449/@comment-6986530-20141115222132

This is a theory I've seen in the past, and to an extent it's one I can get behind, but I think you've misunderstood what it means for a demon to have multiple vessels.

Let's take the instance of Pride; the demon, with four parts of its vessel, is not "in parts" with a part stuck in each vessel, but rather it means the demon can move freely between all the mirrors. That's why sealing one mirror did nothing, because it can just move to an unsealed mirror. Similarly, the demon of Envy may be able to move freely between the two scissors.

So rather than Lust cancelling out a part of pride, its presence in the mirror may have only meant Pride can't move into that mirror. Between that and the mirror Elluka sealed from Twiright Prank, Gallerian probably only needed those two other mirrors to make sure he had Pride.