Ewing was brought in there to teach the big man some low post moves - he hasn't evolved at all until he worked with Olajuwon.
Edit: The only evidence we have of Ewing's ability really is in his coaching or lack there of in Orlando. I'm not saying he won't be a good coach - I'm just saying there's no proof that he is.
mark jackson man, dude holds everyone accountable. i cant believe we let jackson slip away
Maybe he just wants to coach and doesn't care about all that rebounding and playing defense.