See, I don't think Bosh makes much of a difference against the C's. A healthy, motivated KG *destroys* Bosh. Bosh scored less than 12/game against us, and really was nowhere to be found in the two late-season losses.
What you worry about with Miami is a one-legged Pierce having to defend LeBron, and Ray Allen and AB being overmatched against Wade.
Chris Bosh, whether he's playing or not, I don't think that's likely to be the difference in the series. In some ways, I worry more about Haslem, who's willing to play much more physically than Bosh.