Had this come out a couple years back we would have written jokes about MC’s new-normal.
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On the manager, my take is that these kind of people who rise with connections tend to be good at reading the situation and kissing the right ass. They may be incompetent at their job, but they know how to survive. So the moment he realized the MC might give him a solution (or he is gonna be screwed), he will latch on it since his guild is already on the red zone anyway. Not that he will stop being a scum, but at least he knows that he cannot be too much of a scum in the guild (he will still be when he is somewhere else).
His employees hate him, so perhaps he also realized that he at least needed to rehabilitate his reputation first before moving somewhere else (using his connections).