Scott Chandler was signed the day after he was cut. Issues on offense notwithstanding, Mike was traded for a 6th round pick, one season removed from a very good one. There was a reason for that and it wasn't because of anyone on the Bills. Then, he got jettisoned from Buffalo. And still, no suitors.
At this point, I think it's clear what Marrone did. He took little to no risks on offense, played field position and relied heavily on our defense to win games. Our offense sucked, and he was cognizant of that, even if he was responsible.