I doubt that Bulls team would be any better without Rose than the Mavs without Dirk. The Bulls team as it is really have no one else who can handle the ball. They don't have many reliable scorers. Rose draws a ton of defensive attention which frees up guys like Deng, Bogans (

), Korver, Boozer, etc.
Rose is probably over Dirk for these reasons....
1. The Bulls have been bitten by the injury bug all year yet remain one of the top teams.
2. Rose has been very durable and has only missed one game the entire year
3. If you want to talk stats when you get right down to it Rose has to do more for his team. Score, be a playmaker, he damn near rebounds as much as Dirk despite giving up a 8-9 inch height difference, blocks as many shots despite that height difference, etc. He's just as valuable (if not more valuable) as Dirk to his team.