Board Thread:Episode Discussions/@comment-1181222-20180328101515/@comment-25122992-20180329103217

What's more important, there's in fact no actual reason for all the White Zetsu to wither away when the IT was undone. I mean, the pre-existing Zetsu were the product of the previous IT cast by Kagua, but they managed to survive its cancellation by Hagoromo, though it wasn't mentioned how they ended up being stored into the Demonic Statue of the Outer Path. Plus, we have these mysterious Ootsutsuki ruins connected to Kaguya, so even if Zetsu actually need some outer sourse like IT or Demonic Statue to survive, these ruins could be very well sustaining them.