Board Thread:Episode Discussions/@comment-25319479-20160818105554/@comment-4080775-20160821171743

NeedleJizo wrote: ^That's what I meant. It's not about whether or not Obito could dual wield dojutsu; he only had enough chakra for one or the other.

It wasn't even about chakra. Obito can only focus on a single object. Obito can't look in two directions at once, otherwise he'd have stereoscopic vision.