Two things to consider:
1) As recently as January 1st, Powe went for 14 and 6 against Chicago. I don't think his lack of PT was so much an indictment on him as much as it is an indictment upon the fact that if you're the worst team in the NBA, you don't need to be playing and developing future role players: you need to be playing your best players to try to eke out a few wins (like Jamison) and otherwise try to develop young talent. Powe doesn't fit that bill, but it doesn't mean he can't do at least some of what he did in '08 again here.
2) For those worried that we need a big, a wing, and a PG, I don't think we need a PG. Thus, we can afford to take Leon and another big. Why? Because quite frankly, I don't see Mike Bibby or TJ Ford coming here to play the whopping 5 mpg available in the playoffs behind Rajon Rondo. Thus, the the only PG that's going to want to come here is going to be a D-League quality player. And in that case, we're better off just letting Avery Bradley play.