I'm neutral on Dorsey so I'm playing devil's advocate to an extent here, but the concern is definitely not around how he would develop QBs. The concern is that we have no idea what his offensive philosophy is, and he has no experience calling plays. College teams have less time to practice so a complex NFL system that works great in the pros may not translate as well to college as a simpler offense like the type that Briles runs.
yes, BUT ....
he took an intelligent QB (Josh Allen) with less than the best physical skills, and turned him into a playoff QB ...
he took one of the biggest knuckleheads not named Jamarcus Russell and made him into a playoff QB ...
and as far as systems are concerned, 90% of offenses in college football are doing the same things anyways.
but if you want to know what concepts he would run, just look at tape of the Bills this season.
I'm not saying Ken will or should be the next OC, I'm just saying if he is, it would be an excellent hire of a guy who has paid his dues in the NFL, and has earned the respect of those in the profession, even if his resume' is less acceptable to many of the football savants on CIS.