Another good chapter, worthy of a 4/5. I was happy to see the zetsu army finally make an appearance, and in that dramatic fashion was fitting. Can't wait to see this battle get going, considering all the zetsu's survived that fearsome attack. Looks like the edo tensei summons aren't the only 'invincible' enemies to worry about.
BTW, a big thing I have been debating in my mind has been Kishi's idea of life after death; I wondered if he'd ever have an edo tensei explain what the afterlife was like. Seems that after dieing on the bridge, the next thing Zabuza remembered was standing next to Haku after being summoned. I find that pretty interesting.
I agree, we finally get to see how he improved the Edo Tensei technique from when Orochimaru used it.
Kabuto actually knew what Kakashi and Zabuza were talking about. I wonder why he let the ambush squad figure out a way to stop it the technique then.
In regard to this, I think it was clear that Kabuto knew about the weakness and knew sasori etc were on the edge of breaking the hold, but I think he had no way of stopping it.
Remember, he just said last chapter that absorbing Anko's Oro powers would allow him to increase Edo Tensei's BINDING power. I think only now, having started to siphon off her strength, can he overcome that.