i would make him obito but i would hide it better ,people wouldnt be able to guess right after reading kakashi gaiden and seeing obito's ms ability once .i would also get rid of the time-line inconsistencies .i would write a better back-story for obito so that him turning evil would make a lot more sense
i would keep him as obito for the sole purpose of giving kakashi an opportunity to shine
Time travel needs a lot of thought though but since it already factors into his ability then yeah, I am sticking with that untill further explained, time tampering with the body or time travel
I think tobi being obito was quite well hidden. Madara stuff created quite a lot of confusion, so much so that tobi being obito was widely held as the unlikeliest of the major possible candidates.