The coaching level/intensity/detail between NFL and College is night and day IMHO. Just watch the Gruden QB Camp, he has been taking apart their game for years. Many of these bad habits were never recognized or corrected at the college level. Many players need to get Combine coaching to get them ready for the NFL combines because they were not ready for many of these drills or precision of the drills.
Having a team full of NFL coaches is going to be enticing to recruits and lead to better results on the field. I expect to see a much more discipline and esthetic team this year and years to come.
There are different techniques for different level of play. When you watch Gruden he is specifically talking about the NFL where the game will be played faster based on the players on the field. If you don't have three receivers running 4.3 or better, using some of the things he talk about will mess the timing up for the college game. The only thing great about NFL coaches on the college level is their connections as well as knowing what the end game should look like. Illinois is college football and hopefully the staff will coach a college team. If they don't adjust down, they will have the same problems High School coaches have trying to run college systems. Talent levels dictate technique.