They both screwed up Crompton hesitated and Jones forgot where he was.
At your leisure, watch the replay and count how many times you can say, "He is open," before Cromton throws him the ball. What is he supposed to do, slow down and let the DB catch up?
It was a well designed play, but the QB held the ball too long. The receiver's route took him OB. Jones might have been able to do a better job with his feet, but when a WR breaks open and runs 15 yards, then gets the ball when his feet are on the chalk, I think QB indecision is the main culprit.