It's Bill's MO. He waited until Belichick was with the Browns to retire on the Giants leaving them with Hanley. He left Tampa holding the bag a number of times as he flirted with that job. During Super Bowl week with the Pats, he spent his time negotiating for the Jets job, which hurt his team's chances. He had lots of time to figure out his position with the Jets but only decided to step down into an unclear management role once NE was interested in Belichick.

There's no blaming Bill on this.
Just like there's no blaming TO for his antics.
Jones knew EXACTLY what he was getting from both.