This makes no sense to me. If Shaq was fully healthy, then I've got to think that Doc would have played him. Doc's not an idiot, and he knows that 12 minutes of Shaq is better than playing BBD heavy minutes, or Krstic at all.
Now, if Doc was worried that Shaq will only be able to give a certain number of games in the series, or was worried about reinjuring him by bringing him back too soon, that makes sense. However, the thought that he could have played Shaq but didn't for rotation reasons is just crazy talk.