To clarify, my point being, Brad couldn't have told Chester he would rather have the 20-something run the defense over him at that time simply because that 20-something wasn't an assistant coach at the time. The 20-something could've been doing something else, but not that. The two 20-somethings were only made assistants after the NCAA changed the rule allowing two more. Chester was gone for several months at that point.
I think it's pretty clear there was some sort of riff between Chester and Brad and it probably did involve ways to run the defense and/or recruiting over his guys (Sencire and Amani, notably). Side note: On a recent West Virginia podcast, the host made reference to the WVU coaching staffing finding Chester "difficult to work with." I have no idea if that's just sour grapes with him leaving to go to Va Tech, or if there's some truth to it. There are also reports that DeVries himself is difficult to worth with, so who knows.
Interestingly enough, I'm not one to doubt the insiders with the information they provide, but I have, more or less, figured out how to read into what they say. So many people here don't seem to understand the difference between smirking Denzel and "Boom" Denzel. Likewise, The Rock smiling and Tom Cruise putting on his shades mean good things appear to be coming, but they are not an official Denzel boom. Gotta know how to read between the GIFs.