It's not about designing a couple plays. Did you see how Justin Fields looked last year at Georgia? They were incapable and unwilling to use his skill set. He went to Ohio State, in a better offensive fit and looked like a future #1 NFL Draft Pick. Phil ran for thousands of yards in high school. He was a gazelle. His strength is his ability to run the read option, make you pay with his legs and throw the ball, accurately, over your head when you commit extra defenders to the box and play cover 1 Simple, decisive passing schemes... It's the same recipe that they use at Ohio State. Kelly tried to make him into a pocket passer who would run Kelly's complex passing scheme. It wasn't a good fit. Much like it wasn't a good fit for Brandon Wimbush. You can't turn an athlete into a passer... Imagine National Championship Winning, ND great, Tony Rice trying to run ND's "dink and dunk", precision passing attack. He would have looked terrible. Because that's not his game. Kelly's offense is not "QB friendly". It requires a cerebral guy to run it. It's effectiveness is in its complexity, not in the athletes running it. That was the genius of Urban Meyer. He did simple things, at a high level, with exceptional athletes. It was extremely effective... Which is why he could win as long as he recruited. His Ohio State QB's were plug and play.
It's easier to do less with more than it is to do more with less..