Unfortunately his drawbacks will limit his future successes. He's a tweener, some days tweeners play well other days they don't....and that's how they get to be tweeners aka, middle tier, average, etc.
I'd be amazed if he ever made top 10 and stayed there for an entire season.
With a good supporting cast he's serviceable. Greg Cosell (41 yrs NFL films) said about as much on the Herd as far as can he be coached out of his issues-short circuits, he didn't believe so saying that "he is who he is." After 5 years, I'd have to agree.