Yes, Rasheed is taller and guard 4's and 5's better. But lets see how many steals, charges drawn, defelections, etc Rasheed gets compared to Posey. I'm sure you will see it your way, but I doubt I will see it the same way. Posey seemed ready to give his life for a win. Sheed... never.
Deflections? Probably about the same - Sheed has very active hands from what I've seen. You don't really want your big man flopping, because it's as likely to lead to a dunk as a turnover. How about the blocks Sheed gets, or even the shots that he alters inside by his presence? Posey doesn't do that. How about the ability to play in the post? Posey doesn't do that. How about the sheer fact that he's a matchup nightmare as a big that stretches the defense out? Posey could shoot that corner three, but drawing a 3 outside doesn't create as many problems as drawing a 5 to the perimeter.
I'll make conclusions about Sheed's desire to win once I see how he plays in the playoffs. The Detroit team of last year was a dysfunctional disaster; most players would have quit on it. Still, it amazes me how overhyped Posey remains. He's a good player, don't get me wrong. He filled a need on the championship team, and his departure left a hole that wasn't filled last year. He's nowhere near as good a player as Sheed, and I think I'd rather have Marquis as well (although that's certainly debatable). Posey can play the 4, but Marquis can play the 1 or 2. Posey can shoot from deep, but Quis can slash and finish around the basket. Posey's marginally superior defense is offset by Quisy's ability to run the offense. I really think that argument could go either way.