the narrative that MB has ulterior motives, or an agenda, is pure trolling.
MB has repeatedly stated and shown in his actions that what he cares about is building a cup winning team and to repeat for contention multiple times.
his best transactions, signings and hirings as well as his worst show that he is not affraid to make the decisions to achieve that goal.
and if you want to mention Sylvain Lefevre, Drouin for Sergachev, Markov, Alzner or whatever.... even in those awful cases he kept actively trying to improve the team.
M stays because he has done the job, and he leaves when he is willing to look for another chanlenge.