Football is interesting. You know pretty quick if someone has "it" or not. Absent Kurt Warner, QB ability is pretty evident. Mond and Love? Not NFL QBs. Not starters, probably not serviceable backups. Zimmer's quotes about Mond at practice tell you that.
Also, as for coaches? You can usually tell if they have "it" as well. It became clear that Zimmer wasn't ever going to win a Super Bowl. So then, you dump him. You could tell Andy Reid would, someday, given the right roster. I think McVay will win one. Same with Lafleur and Shanahan. McDermott?? at Buffalo as well, given they get a running game.
Good for Minny in finally making a move. While I love CMC and think he is fantastic for ISU, I see the same shortcomings of Childress and Zimmer in him. Eliminating errors to keep the game close means errors are magnified when you do make them.