He did too bail. He was offered a position on Sark's staff, and he turned it down. Orgeron is dirty. Not even close to being on Purdue's radar and he never will be.
Babers is a guy with strong Midwest ties and he runs a very attractive style of offense - an aerial attack that fits with Purdue's traditional strengths. He is a good recruiter and he's won every place he's been. He's also beaten 3 BIG schools in 2 years, including Purdue. Purdue could do much worse.
I wouldn't consider that bailing. No way was he going to be a DC or associate head coach on his staff. More than likely it was done due to his success and wanting to keep some continuity with what appeared to be a loved coach by the players.
If you were the stand in CEO of a company and the board decided to bring in a new CEO and they offered you a job in a lower level than what you had before being the temporary CEO, I'm sure you would tell them to shove it.