Basically your argument comes down to one game then - this year’s MAAC championship. Basing a decision on one game is not a great strategy.
The Cowboys beat the Steelers in Super Bowl XXX, and cornerback Larry Brown was the MVP. Based on that one game, the Raiders signed Brown to a huge free agent contract. That press conference sounded a lot like what I would anticipate McNamara’s would sound like - he’s a winner, he comes through in big games, yadda yadda yadda. The problem is that one game for Brown was a career outlier - he was a decent but not great CB who had a great game. What we don’t know right now is if that championship was an outlier for McNamara and he’s a decent but not great coach, or if it’s the first of many in a great career.
He might be a great coach. I want more than one data point to decide that on, because it’s a big, big risk to use one data point. The guys pushing for McNamara are too emotionally invested and are putting way too much stock in one data point. The “throw out the Kenpom and Net, just look at the championship” position is really “let’s throw out all the other data and focus solely on the one data point I like!”