Board Thread:Theories and Speculation/@comment-1783334-20150507053750/@comment-2043993-20150507180424

it might be Kabuto under the hood, reason: he's an old enemy, he's capable of going up against very powerful shinobi, he experiments and have a large amount of intel on nearly everyone thus making it likely that he would have found Obito's collection and transplanted some eyes to various people, he also had a white zetsu to play with thus making it likely that the boyn with the sharingan is a product of those experiments, plus his whereabouts are presently unknown after the war.

reasons against: he's apparently turned a new leaf and become sort of good, helping Sasuke and not wanting to base his life on something or somebody else ever again. Plus, why the heck would he ever care for the uchiha name?!?