I suppose the conversation is about the last 15 years, otherwise I'd point out that Stoops probably isn't the best coach at OU.
In the last 15 years, as much as I hate the guy, I have to vote Snyder as #1, just in front of Saban and then that ****ing prick Carroll.
If you look at how terrible KjSU was before him, how quickly they were returning to **** when he left, and how quickly they returned to top 15 form when he came back AND factor in the number of obstacles that KjSU has that none of the other coaches in the conversation have to deal with, he seems to be the number one guy, imo.
Only strike against Snyder is the lack of a National Championship. Everything else you say points to a miracle worker.
It's true that he coaches at a school with no academic standards and that he has taken full advantage of the JC system in Kansas (and California.) That said he has taken what he has to work with which isn't much an won a lot of games.