Leon wasn't just good in 2008 - he was fantastic. Borderline all star good. He had 21 PER and then a 17 the next year. Also keep in mind he was hurt late in the season and kept playing - then was injured in the playoffs in 2009.
Since its become a BBD vs Powe discussion:
Athletics:
Both are very strong players that have good upper body strength.
Powe has freakishly long arms for his height, good leaping abiility, and very soft hands. Injury prone.
BBD has uncanny agility and dexterity, and the bulk to bang with bigger players.
BBall:
Powe is better finishing at the rim, rebounding, and moving without the ball (running on the break, cutting to the rim, and positioning for boards.) Defensively Powe could take a charge, block a shot, and had active hands. Pure PF.
BBD is a superior ball handler and has longer range on his shot. His quick feet make him a much better man defender - which makes a big diff in Boston's system. BBD has developed a great knack for taking a charge. BBD can play C or PF.
But you have to be in it to win it, and BBD has stayed healthy (generally) and Powe hasn't.