That logic doesn't follow unless he's going to become a position coach at RU and will be directly working with players in that capacity. I would 100% take him as a WR coach, though we wouldn't be able to afford him for that.
He hasn't been calling plays, he hasn't needed to design game plans or adapt them to defenses, he hasn't needed to sit down and talk with parents or HS coaches, sell a vision/program to a 17 year old, or to build basic fundamentals/work ethic/etc of teenagers. He's only ever been called on to run an offense once in his long career, for just two seasons... and that game plan was largely dictated by Schiano (run the ball, kill the clock, keep the ball out of their offense's hands.... the offense is primarily an extension of the defense) and after doing so, didn't go back to it for almost a decade.
If he's the pick, I'll accept it, but will be disappointed. I'll support him and hope for the best, but it'll take a lot to build a sense of optimism.
Do you really think offensive position coaches have no role in the game plan? That it is not done in committee headed up by the OC and possibly HC? Do you think a WR, QB or TE coach doesn't have to know about the game plan?
I get the idea of thinking you need youth to recruit... or some professor of some specific school of offense... but plenty of coaches have proven they can plan and call and offense even at an advanced age. Perhaps McNulty would be better here the second time around without Schiano over him.. you never know. What I do know is that when he took over out offense.. he did great.