I think there is a lot to like but IMO that idea may be overblown. He would have been only studying defenses all week, not concentrating on offenses as much in the film room, and then on game day when his defense was on the field, he would be talking to his offense and thinking about what they are doing next. I'm not sure the one year gave him any great insight into top offensive players, changes in the game, or much of anything new he could bring to the table.
Sure, while studying how the defense he will be playing the upcoming week dealt with the offenses, gives him some look at some players and systems, it's really about how the defenses reacted. And it was just one year.
Those glasses are fake. I know that cat and those are not his glasses.