Hard to say. Obviously there are many nights when this team looks like they could win it all. But the playoffs are different. And the window to win with a healthy Joel still feels small. Lowry could really put them over the top, not just this season but for three seasons, and improve the team on those nights when one of the stars is out. I assume Thybulle would get some of Green's minutes, but also wouldn't they basically make Simmons a point forward with Curry and Lowry both on the floor with him? And if the buyout is such an easy option they can use that for another body.
I think they basically acquired Green to trade him if the opportunity arose. The expiring contract and ability to match $ was more valuable than his talent, even though the talent is still there. But he's still not what he was, he was awful last playoffs, and he won't be here next year. If they don't go big and bold - which is Morey's style - and lose in the Eastern finals, what then?