It looks like Shaq is getting into shape - better than he has since he was in Miami. I think he really is motivated. He knows this is his last go 'round. He respects the Big Three. He respects Doc.
Honestly, I'd hold him out until the last week of March, injured or not. Why use up some fuel when we really don't need to? We hit a soft spot in the schedule and we are deep enough to get through it without him. We can let the new guys learn the system and/or get into playing shape.