What does contribute mean for Powe this year? 3 minutes a game in the playoffs? If Cleveland had Wallace and Davis coming off the bench they probably would have passed on Powe as well.
also, as far as CLE is concerned, they have Varejao and Ilgauskas so it's not like they were without options in their frontcourt.
and BOS didn't ultimately pass on Leon. They offered him a contract.
The overall point here being that the contract that Leon signed is not prohibitive...
So, again the plan to not offer him a contract right out of the gate, instead telling him that they would revisit him once he showed he could play, only to later decide they would offer him a contract was really the problem and didn't make much sense.