The talent is undeniable although these issues may have stalled his development as a player - a 10 mil price-tag speaks of pretty pedestrian output at Rubin, not that I have watched any of their games

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IIrc, his "problems with coaches" involved late nights/early mornings at bars and such, and not only, raising questions about maturity and dedication and those would and likely were turn offs for many teams. Sure the guy is still young and can grow out of this but he better already be on that track 'cause it ain't easy restarting a stalled career or changing perceptions.
Guess would have to prove himself before getting another shot with a big team. Problem could be with him being in sort of a no-man's land right now, I think - too expensive for smaller teams, too much history with character concerns for a bigger team to wanna take a chance on him. Eventually he should get his chance - too talented not to - but he better make the most of it.