Unless it involves AI?
In AI's case it's obvious the team is better without him. They're a perfect 8-0 when he's not in the game.
As for the Heat, it's less apparent how Jermain O'Neal has impacted the team since they're basically .500 since he joined the squad. The only thing that IS apparent though is that O'Neal's production under the basket has dropped off significantly. That's the only thing I'm pointing out here.