Yea, if Jean wanted to, he wouldve been gone, adamantium isnt indestructible, just more molecularly stable, more concentration and "poof" .But yea, Logan has stabbed Jean ie Endsong, where Logan stabs Jean to weaken the Force's influence, because the only way Phoenix dies is if she wants to. But it might be completely different than the comics. Assuming that Jean cannot revive herself, Supes would probably win. Unless Jean creates a kind of field where there can be no intertia or gravitational influence, like in the movie how everything kind of just floats, but I might be overestimating her current capability.