Why are you convinced he did? Evidence of that?
Ask yourself some basic questions and find the answers without having to hedge your bets.
After the front 3-4 - what do we have behind them?
Our LB's are pedestrian at best. Not much speed and average in the athletic department. Throw the Jack in there, Sherman as well.
Then the secondary. Quick - name the corners....... Tommie Hill, the guy who has gone back and forth from D to WR and is now the LCB who completely forgot what every high school CB is taught, you never turn your back to the side, always the middle. Then who is on the right side? That would be Marques Buford who was a safety and is now expected to be a corner covering speedy WR's. How about the safeties? Singleton who you have heard very little from, Hartzog is a 5'9" former CB who couldn't cover and is now a safety for crying out loud. How much run support is he going to provide? And probably the guy I am most disappointed in but it may not be his fault is Gifford. You just don't hear his name and he seems slow on the read.
I seriously doubt Butler changed the D for White. They, as a staff, may have realized they do not have the skill back there and are compensating with a deep zone, keep everything in front of you look. You did see what happened to Hill when he was locked up one on one, but I guess you will attribute that to the injury. Ceyair came in and played admirably for Hil.
Here is another thought. Can you imagine how our WR's and Dylan torched this back 7 during the spring and fall? We have some dynamic WR's that taking the top off of things. That had to be eye opening for White and Butler.
Coaches are not stupid. They don't forget anything. They see what other teams do to the teams they are playing and see if they can work it into their scheme. People should have been more concerned about UNI as that was not a one-off. They moved the ball almost at will but when the field got short, they stumbled which falls into our hands.