We would have Powell, Nurk, and Roco in the starting lineup with them, which is worlds better than the Oubre/Wiggins/Wiseman troika that Curry and Green played with last year. As mentioned, Green wouldn't be the 2nd or even 3rd option in Portland. He would be a defensive anchor (honestly, would there be a better defensive frontline in the league than RoCo/Green/Nurk?), a secondary creator/facilitator, and an occasional shooter.
And most importantly, a better fit in the lineup with Dame than CJ, and would likely make Dame happy.