I suspect the position changes will be minor. The real difference will be intensity and physicality. I really like this little shakeup, and I really like Bronco back running the defense.
I've also been interested in watching coaches on the sideline. I'm rather surprised in seeing Bronco, apparently, uninvolved, unemotional, never moving, never talking to anyone, just standing there watching the game. I'm sure he does more than that, but watch any other coach, especially in key situations, key downs, penalties, key offensive or defensive decisions, and those coaches are very visible, very active, and obviously involved in the decision making.
Bronco has always said he leaves the offense up to the offensive coaches, the defense up to the defensive coaches, etc; but he IS the head coach, how can you not be involved in what's going on, in the decisions, the penalties, talking to the officials, talking to players as they come off the field, or go on the field--I just never see any of that. Maybe that will change now that BYU has lost 4 in a row, and faces a losing season, no bowl game, and a very unhappy fan base.
The worst scenario for Saturday would be that SDSU scores 24 points in the first half, like everybody else has, and BYU loses again--then what? Or what if the defense holds SDSU to 13 points but BYU only scores 10, and we lose again? Will he fire Anae?
I suspect there is indeed a sense of urgency, if not panic, among the coaches and the players. I don't see these guys giving into another loss, a losing season, a disappointing senior year, etc.