Board Thread:Versus Debates/@comment-35155071-20180330190048/@comment-30323490-20180407115402

Even if he has Susanoo, what can he do against Kamui? Obito can use Kamui flawlessly for quite some time, unless he needs to be materialized permanently, in which case he can stay 5 minutes max. But this is not the case. It's totally different than the Kinan battle. Itachi will exhaust his eyes completely and will probably be near death before Obito even feels tired.

Also, i'm pretty sure that Obito could absorb Totsuka blade into Kamui dimension if he goes close range, but he does need to be careful.