Based on my conversations,
Moos was fired/retired because he did what he was supposed to do and it was time to take the next step.
Do you want an AD that is coasting into retirement when NIL is launching, 1 time transfer is hitting athletics hard, coming off a pandemic, etc...? You need to have somebody who is innovative and willing to get going to where the puck is going. You need to have an AD that can take advantage of the changes that are happening.
You don't fire the head of a 9 figure organization because he isn't a "yes man." You don't fire the head of a 9 figure organization because he has a little tension with an employee.
Sucks for Moos because I think he did a lot in his short time here and wont get to see it through, but I 100% get why you make this move.