Walters was obviously in way over his head as a HC. He will probably rebound somewhere as a DC.
He walked into a losing situation though. Brohm stopped recruiting his last year and left a depleted roster when he left Purdue for his ugly ex girlfriend. Any good players Brohm didn't take with him were poached by teams in the portal (Scourton, etc).
Walters was hired late in the process and cobbled together a coaching staff where basically everyone was promoted from a lower position. Nobody had any real experience, including Walters. He then gets Graham Harrell at OC, who has experience, but a very underwhelming experience coming from WVU.
He then hit the portal and did what he could. On paper, Purdue scored some nice portal players, but Walters and crew were too disconnected to make anything meaningful happen on the field.
By year 2 he was losing the locker room. Rumors leaking out from former and current players on his arrogance and refusal to change things that aren't working.
His terrible defenses at Purdue being mind boggling since he was an ace at Illinois.
Then the rumors about Walters having an affair with his secretary came out. There was some speculation he would be fired for cause in October. I'm hearing he's in the process of his wife divorcing him.
By the end of the season this hire was a train wreck. Too much damage done to give him more time. And nobody was buying tickets or investing in Purdue football with Walters back next year.
Purdue really needs to stick with an offensive minded coach and throw the ball around. Keep the Cradle of Quarterbacks thing alive. It sells tickets and works well for them.