Kelly coaches offense and doesn't coach defense. So

here is what actually happens day to day.

1) Kelly allows the DC to control every single aspect of what happens on defense during practices and games: how to allocate time, who to play at each position, what techniques to teach or not teach, etc. He also allows the DC to create every game plan on his own and lets him do anything he wants during games. Kelly spends 0.1% of his time on defense.

The net result is if you have Elko or Lea -- you can get a good result. If you have BVG, you get catastrophic results. Unlike Holtz, Kelly is unable to personally step in on defense and stop any bleeding if it exists. As the BVG era pointed out -- he actually can't even recognize that bleeding is happening until you have bled out entirely.

2) Kelly spends 99.9% of his time on offense. He controls every single aspect of the offense. He personally mandates all practice time, what types of plays are and are not allowed, who plays at every position, how practices are run, how much time is spent on any aspect of the offensive side of the ball.

Long makes suggestions on what ND should do. Long handles administrative elements of running the offense, looking after players on that side of the ball, etc. Long is basically an assistant coach with the title OC.

Long prepares drafts of game plans. Kelly edits them. During games Long calls plays based on parameters mandated to him by Kelly and Kelly has a veto per play during games. Kelly tells Long we need to pass here, run now, do a long pass, short pass, etc.

It isn't that hard to grasp. Offensively, it is nearly identical to the Holtz era. Lou also had offensive coordinators on his staff. Lou absolutely controlled every single aspect of our offense. That's no different under Kelly.