If Rondo shot 75% from FT last year instead of 62%, he would have scored 37 more points raising his ppg to 14.2 from 13.7. Not too big of a difference when you get to the line 3.5 times a game.
His 62% rate isn't what hurts, its when he goes on these horrendous cold streaks. If he could get to a CONSISTENT 70%, I think that's acceptable.