Ray is still a much better shooter and I'd certainly rather have him taking any clutch shot than Mayo, but Ray has essentially NO ability to get his own shot, struggles taking it to the rim and can be atrociously inconsistent when it comes to rebounding. I mean, if the other team is determined to crash the offensive boards, there's very little Ray can do to stop them.
Mayo has youth and athleticism, but he'd also force the Celtics to change up their offense. You certainly won't have Rondo pounding the ball for 15 or 20 second while Mayo runs off multiple screens. If we're gonna get past Miami, Doc and this team have got to find something different than the past two seasons.
Mike