Maybe he thought the best thing for the club was to stay instead of throw it into turmoil by quitting. Just another way of looking at it.
that's a fair point. but that would be a very noble thing to do... putting his own reputation at steak for the sake of the club. If that was the case though, then you would think that he would also be the type to offer his resignation and turn down a severance package (like Advocat) when it became clear that the fans and the owners had lost faith. However, he didn't do the latter so i doubt that his motives for sticking around were so lofty.
Why would you turn down money? If you didn't want it you would take it and give it to charity or something.
He had worked his whole career to manage a big club. Once he was given the opportunity he was not going to let go of it easily. He wasn't selfish, he was just very determined and had a lot of self-belief.
And to be honest we will never know whether his self-beleif was misplaced or not. He had periods when he looked an accomplished elite manager (when we nearly won the league and obliterated teams after 15 minutes) and then others where he looked too inexperienced for the job.
Because of FSG's restrictions we will also never know who should take the blame for things.
He came in as a very inexperienced, very promising manager with a lot to prove.
He leaves as a much better manager with still a lot of promise and with still a lot to prove.
