capela has played a grand total of 90 minutes in the NBA - i'd take that as a major warning sign.
hardly any NBA players who eventually turn out to be good or great will play so little even in their rookie year. so no way do i trade rozier for him, rozier inherently has more upside because he hasn't had a terrible year like that yet. if we were to get capela, at most maybe i'd send out the minny pick.
as for motiejunas and sully, what's the point? we don't need another defensively mediocre big man. keep in mind montijunas gets a lot of open shots playing with dwight and harden. sully ha sa tougher task here. IMO sully, despite his warts, has the better upside. he also has greater downside because of his weight and back.
since we're rebuilding, we need the upside more than they do. and they need the stability of a healthier and better-condiitoned player.