Well, it's possible if during the moment in where he went on a rampage screaming "wooohhh", he could've been influenced by the mazou. I wouldn't believe it at first but I recently read a thread in which it actually made sense. It would actually fill many plotholes. Though if you're saying that Obito is being controlled by the Juubi at all times, then I don't agree with that since Obito still has his mentality and practically had a personal moment with Kakashi.
It could just be that the Juubi's hatred partially influenced Obito the same way it influenced Nagato against Hanzo. Zetsu seems to be created through the Mazou that at some point, could've been the Juubi's container. You'd be surprised by the similarities of Obito and Nagato's reaction in the moment of rage. Not completely taking over but just influencing them. In the end, the Mokuton seemed like it was reaching out to the moon.
I'm still a bit unsure about this but it was atleast something new. I wouldn't be surprised if it came to be.