Once he's okay with the 4 yard completion he will start anticipating it and those will turn into 15 yard gains because he'll be getting the ball in his playmakers' hands with a chance to do something after the catch. Too often he tries to force throws down the field unnecessarily. And those plays result in drive killing incompletions, a scramble situation with nobody open deep so its too late to come back to a short timing route, or interceptions. Zach will be so much more dangerous as a runner if he learns to simply take the easy throw when its available because defenses will start playing him like a pocket QB and the seas will part for him to get huge chunks with his feet.