Look it is easy to see what happened to Mansfield...
Mansfield decided to retire. Cook said ok. In the meanwhile he watches underlings in the department f-up stuff including the e-peat (environmental stuff) debacle which Mansfield graciously took the fall for. Then in other departments where people have left Tim Cook watches more screw ups, like with the Apple Store "layoffs" that had to be immediately rescinded. Finally the quality control elsewhere shows flaws with a series of bad tv commercials coming out that also have to be erased from the airwaves and the internet within days of coming out. All this has to be concerning to Cook even though the company overall still continues to print money.
Soooo.... Tim Cook goes to Mansfield and says he needs his experience to help guide future manfuactrering decisions. Bob says "sorry, I want to sit on the beach in Mexico!" Tim then offers him more money than God, lets him keep a SVP title, and offers to let him works a couple days here and there around whatever schedule he basically wants, ie. to be a high paid consultant really and Bob, goes "sounds good!"
Tim Cook has more money than God at this point and I think he just paid a retiring vet a brick ton of money to stay in a made up title roll just to consult on decisions parttime...