Obito's a terrible character that make no logical sense in so many ways, it's baffling.
He slipped through the rocks... How???? Who knows, it makes no sense.
He couldn't do it before... So nix that concept.
Can't be his 2 tomo Sharingan... He just awoke it 1/2hr before he was crushed, and it doesn't do that.
It's not an MS ability.... He awoke that when he saw Rin die, and he never activates MS to perform the technique
Can't be Hashi's cells.... They weren't implanted yet.
Obito's the biggest disappointment in the Naruto series.
Tobi didn't bother so much me, but since he's revealed himself as Obito... Like nails on a chalk board.