Slope? Really? You are using that as an argument?
Yes, the linear regression over his 5 years a s head coach. What would you like to use? I do the calculus and give you the rate of change as averaged over his years here, but as I'm sure a man of such brilliance as yourself would quickly realize that the rate of change after the MNC season will dominate the numbers and provide an even worse outlook.
Take a few more classes and you might come up with a better mathmatical argument.
Try figuring out what the solutions look like before shouting off at the mouth.