Killer Bee hardly escaped? What? You must know Bee can come out of any part of the Hachibi don't you...thus he was never in any actual danger/ We know exactly why he made it look like he was losing.
Also...what doesn't make sense, as far as we know, the only difference between an Uchiha with Sharingan and a normal person with Sharingan, is the Uchiha has it easier chakra wise. Kakashi can use Mangekyo just as well as any of the Uchiha. but his chakra supply and body are not suited to it(ye he still teleported a Bijuu).
Now. A senju body is even better than an Uchiha's for the whole chakra issue with Sharingan is it not? Nagato is surely proof of that when you compare him to Itachi and Sasuke
And finally, naruto has a Bijuu in him..so chakra would be even less of a problem than it was for nagato.
"The power of Uchiha" is the Sharingan anyway. That's all i'm saying. That is the end result of their bloodline. Doujutsu. The sages body -- Senju. Can handle the sages eye's - Sharingan/MS/Rinnegan, better than an Uchiha can