Quote Originally Posted by David75 View Post
It's semi-filler in the sens that it explains part of the edo-tensei Kabuto has been developing?
What is there to develop? It's the same in the 4th War as it was when Orochimaru used it.

Yet here, it works completely differently? Microscopic snakes in magic water?

Also, nobody was supposed to know Kabuto knew Edo Tensei till it was revealed later. But if this is to be believed, then Yamato knew about it the whole time.