I wouldn't trade Rondo for a gunner Guard who doesn't play defense. It's not a bad thought, but in addition to it being way to early for Clev to look at trades, he prefers to have the ball in his hands and play pick and roll, and look to score. He's not a great player in transition either, he prefers the half court.
We have to many guards already, and iso pick and rolls with no defense played don't really fit our system. I would take him if he were cheap, but not for Rondo.