Part of Rondo's role on the team was to get the big three up and running.
When they weren't scoring, Rondo made it easier for Perkins and whoever was in his place.
I ask you, why the hell would Dwight want to play with Paul, when he can only get the ball from point guard, and Paul hogs the ball as much as he can. And when he can't, he gives it to his PF or SF.