My guess is: there is truth to Marrone having issues with the personnel people and wanting more authority. We've all seen the Bills draft day video and he is a Parcells guy after all.
My guess is: that Polian wanted to keep Marrone, Orton and bring in Smith to run personnel.
My guess is that the Pegulas were going to give Marrone an extension, but not the power he requested, and do what Polian wanted. They are now leaking the extension stuff.
My Guess is : Polian thought the so-called Czar roll sounded good and wasn't a major rebuild job.
My Guess: then he heard from his Buddy Doug that it was business as usual at 1BD. They were still calling him names and Pegulas had no plans to get rid of some at 1BD.And that they would Fug up their plans. So he said Fug it! especially since his boy said he was leaving.
My guess is Sexton/Marrone said we can get 4 mil for nothing, go to my hometown and get what we want and be the savior, get away from the Media and people at 1BD who I've worn out. And, that it was great to have Polian say I was a COY candidate, but being the selfish prick I am-well I can run my own show in NY and don't need Bill and his old personnel guy.
My guess is no more complicated than that. Really pretty simple.