Many of the initial questions surrounding North Carolina’s hiring of new head coach Bill Belichick had to do with recruiting in the new-age college football world: How would the persnickety former NFL skipper adjust to connecting with high schoolers?

The Atlantic Coast Conference has three former NFL head coaches leading its football programs this fall for the most of any league.

But Belichick, widely regarded as one of the greatest—if not the greatest—NFL coaches of all time, is already noticing differences between players at the college and pro level. And it goes beyond the obvious age and skill differences that one would assume exist between the levels of football.