They don't have to be difference makers. When you have 3 above average players (Aminu, Harkless, Kanter) one average player (Leonard), a good role player (Curry) who can knock down 3's and you replace them with players who are grossly below average (Tolliver, Bazemore, Melo, Mario) and promising but raw players (Little, Ant) it adds up to a big difference. It's gonna show next year when there (hopefully) won't be any more injury excuse to fall back on. The only hope is for Ant & Little to improve significantly which is unlikely even though they look promising... probably will take a few years for them.