My point is that scheme and execution puts players in open spaces, the QB throws the ball on time with accuracy and the receiver does his part to catch the ball. In between all of that is the defense, which has a say in all of this happening. From what I see, the most consistent problem in terms of success lies most with accuracy on the QBs part. Guys are getting open and defenders are steps behind them; but the ball is either uncatchable, requires heroic effort on the WRs part, or is thrown in a manner that brings the trailing defender into position to impact the play. Accuracy.