If Uchiha Obito had never "died".......

[Omnipotent]

What good would Obito be with one 3T sharingan eye that can't even use kamui?

He dies later on, probably, even with the Senju DNA.

That is, unless, he relies on mokuton. Then he'd >>> Yamato. Low-Kage.

 

[Stark]

They each had the Sharingan? I think they would get the Mangekyou eventually since Kakashi stated that he lost many friends in the past to Team 7.