I think the "holding back for obvious reasons" was in reference to the situation with the young DB's being banged up during two a days in August. He said many of them learn by repetition, but there's no reason to practice specific stuff if those who are going to be playing cannot practice. Therefore, it put them about 6-8 practices "behind". Now they are learning on the job...so they are holding back on some stuff, the obvious reasons being the DB's are YOUNG, first and foremost, and secondly, they have needed more reps and that has been slowed by preseason injury.
I was impressed with this guy. He actually says alot, he can get quite specific although that may be just to confuse the likes of me! But he made several very good points...the main one being, the face of college defense is changing with all the spread offenses. What worked 3-4 years ago isn't necessarily what is working today in defending the offenses.
I certainly wouldn't confuse him with anyone else, including Greg Davis.