Jesus Christ. There's not one thing in this post that is correct.
He took over after Derek Mason led us to an 115th ranked (YPG) defense. In scoring, we were 89th.
Just stop. And as a fan base, we need to stop looking at the ONE season under Knowles were we had an elite defense and acting like that's the "standard" around here. As much as I would love defense to be our identifying characteristic, we haven't been good on defense in back-to-back years in this millennia. We used to have an identity- offensive firepower. Gundy crushed that. Now we have nothing, but the easiest thing to fix with Gundy as HC is the offense. Let's fix that, then worry about trying to fire a DC who's not even 1.5 seasons into his job.
Edit: And before anyone gets me wrong- we absolutely should have paid up to keep Knowles around. Not that we would continue to have an elite defense- that was due more to the fact that we had a supremely experienced and talented defensive group with one of the better linebackers our program has ever seen. However, the fact that we kept throwing money at Dunn and didn't pony up to keep Knowles around, the only one of our coordinators who had proven that he knew what he was doing, speaks volumes to Gundy's performance as "CEO" of the program.