Board Thread:Naruto Discussions/@comment-16064415-20140822214551/@comment-1411686-20140822223025

no its not inconsistent at all. Obito was imitating Madara and mimicking his voice; it is not weird when many many others can do the same.

If you mean the retard-Tobi, he basically left Akatsuki in Nagatos hands, and he was probably just being sneaky to see how their progress is going while still remaining in secret. And it seems obvious he was imitating Guruguru in that regard.