Re: Why is Wade one the best shot blockers....
Wade's a great help defender and weak side shot blocker because he's an absolutely LAZY man defender. He sags and helps out real well.
He's essentially the exact opposite of Kobe.
Kobe being a show pony gets up to play man defense against big name players, and he's great at it when he tries. He conserves energy in team defense and rotations. Basically is a lazy team defender.
LeBron is a great rotation defender. He's a decent help defender, but he wreaks havoc in passing lanes. When he tries he's a decent man defender, better than Wade in that regard, worse than Bryant when both are geeked up to play it. He actually usually lets his man beat him and attempts to recover with his length. Also to not draw fouls.
On average LeBron is the most consistent defender of the three. But he isn't as exceptional at any particular aspect as either Wade with weak side help / blocking shots, or Kobe's man defense.
The defensive abilities of the 3 best post MJ perimeter players in a nut shell.