Wade needs to be more aggressive, but a lot falls on oscar and not running more offense through him.
keep in mind that the other players steal a lot of wade's points, assists and rebounds. for example, Wes's numbers are good exactly for the reason I just mentioned.
Over and over in a game you will see Dean work his tail off in a game and box out and Wes run right next to Dean and get the rebound. It doesn't really bother me game wise because stats don't reflect who does the work on the boards. On offensive rebounds it's rather hard to get a rebound when you are asked to play 25 feet from the rim. In practice we do a rebounding drill where all 5 box out and we demand that the ball hits the floor while we maintain the box out. Great drill and if done in a game will lead to 0 offensive rebounds for the other team.
If you want I'm sure Dean could get 10 boards a game. Just tell him don't box out, just try to get the rebound wherever you happen to be on the floor. That would lead to getting massacred in the Big 12 on the offensive boards. The bigs in the league have to be boxed out. The guards not quite so important.
Keep track over a few games how many offensive rebounds we give up in a game in the time when Dean is out compared to when he is in. Unfortunately boxing out is not a stat but it's much more significant than who gets the credit for running in and catching the easy rebound.