Well, I loved Adrian as a great kid and rep for the Huskers. Part of his curse what he had some really good talent around him his freshman year. The expectations going forward were high, perhaps way too high. I started seeing things on film that bothered me a lot and when I mentioned them I was called out. Always a reason for the play but really, some kids have it and some don't. The three positions I have always felt need the most "instincts" are LB, QB and RB. Adrian had guys his freshman year he could depend on being where they needed to be and making plays so his need to read and interpret what was going on was reduced. His soph year I thought he was just not seeing the field well, making good reads on what the D was doing and making quick adjustments. He compensated with his legs which is fine and he is still a very good QB, it was just something that never developed in him. At least that is my OPINION.
As for the leg drive and chopping steps, that falls right into the two different styles. If you let the D make the first move, you have to have feet to shadow him and then either cut him off if he is headed play side or drive him past if it away. Thinking about Frosts O with all the looks, motion, eye candy stuff, this type of blocking makes some sense overall. Anytime you get a guy guessing the wrong way, you don't have to pancake him, he can't make the play anyway. But just like there are levels of HS, to small college, to D1 there is a wide disparity of athletes in D1 overall. Think of the different stance you used in basketball when you were guarding one on one - back over your butt, feet apart, slide don't cross over, eye on the belly button, etc., you are matching his movement and then cut him off when he goes to the bucket. More of a football move to drive straight forward, get the guy off balance and take him away from the play, thus the comment by players about the line moving forward the back falling down for a 3-4 yard game. You don't get those with a react block very often.
Another point someone asked was about the passing game. As you watch the teams who like to run, i.e Wisconsin, they don't mind tipping when it is obvious 3rd and long. They get the OL in a two point, drop step already made and ready to take on the rush. The in between plays where they drive out hard, engage and block straight up give the impression of a pass.
I have nothing to base anything off of, I haven't watched a single Pitt game film but for some reason I expect to see a bit more robust short passing game next fall. I think the players are there for this and it will give the OL some time to adjust as well plus that is more to the skill set of Thompson. From reports I read the long ball is not his forte. I also think, again speculation on my part, that with Adrian's inability to see things quickly, they didn't exploit the middle of the field as much.
As a qualifier, I could be and very likely am wrong about some of this.