Let's also not discount the fact that Doc has been babying Jermaine O'Neal and playing him 12-15 mpg. My gut feeling is that he can play more minutes than that.
If JO and Shaq can both give Doc 20 mpg, we go from a team with a legit force in the middle for about 12-15 mpg (right now) to a team with a legit force in the middle 40+ mpg. And that could be a huge, huge difference.