People just get bored and go do something else for a while sometimes. Or he's got some beef.
Me changing can never be used as an appraisal of my old organisation so.
Disclaimer: regarding money, if I get enough in max a year to rezire forever after that, I might be tempted. Which won't happen, because a) I'd just leave a year later anyway and b) nobody would pay me high 7 figures just to not quit.