the ball movement tired the short/slow/old Heat rotation. you exactly won't get much out of Ray Allen if he has to be chasing the ball around for a few possessions, same with Miller.
with no TP, who draws the defense on a pick and roll to get those guys open? Green can't handle the rock to get open off a pick and Neal can, except it's probably going to be a quick triggered bad shot.
no chance Parker misses Game 4. by journalistic standards, he has to say there's a chance he'll miss because of injury or that it's "unknown", but everyone knows he won't miss for a minor strain. The Big 3 have played through worse in earlier rounds in the past.