do u think that madara will use black zetsu again on obito now that he is weak to revive himsef in the next chapter or 2 after obito joins the good side bcz of tnj?
No; Obito's will is getting stronger right now . Naruto made him to value his friends . Remember that he tamed the Juubi just by the memories of his team , not by power .
He might, but I wonder if obito switches sides,if the alliance would still kill him to stop madaras revival
And isn't madara going to have to seal all the bijuus in the gedo again