obito's going to use rinnegan outer path to bind juubi not a seal which was used on kushina ...so juubi can't be tamed
Considering Madara teached obito how to release kurama out of kushina, couldn't he, in his current state, just do the same thing to obito and release juubi...
*taught
Anyways, yeah. He could probably do so, but it'll be a bit of a trouble, considering how persistent Obito is.