doubt they can use his MS.
I'm not even talking MS. Just Obito in general.
there would be a very terrified Shinobi alliance that's for sure.
And people say there isn't such thing as plot, they are in denial.
Plot? How about self gratification? If I want to kill a man, I'm going to kill him. I'm not going to pay someone else to kill him because I have self pride and it's that pride is one o the reasons I'm even killing a man. Obito wanted to do things himself. Using the name Madara sounds like a contradiction, but in the end, he didn't even really want to reveal himself. Self gratification. As long as he knew it himself, he felt good.