You are comparing a corporate scandals, but the alternative theory in this forum seems to be a power struggle and power struggles have completely different mechanics.
Think of it as the difference between a vote of no confidence and a coup. In the first case you let things simmer for a bit to allow you to wheel and deal and to arrange for the future. In the second case, even in the case of a parliamentary coup like the 9th of Thermidor, the most important thing is to act fast.
A boardroom coup isn't remotely like one where one looks for the gap where the guards and guns aren't and worries about the deposed leader being reinstated by an angry mob.
If they had the small majority needed to get rid of him over mere differences of future vision they could have done so on whatever timescale they felt like, with no need to rush the departure and certainly no need for the goodbye to be inflammatory and potentially legally actionable
Think of it as the difference between a vote of no confidence and a coup. In the first case you let things simmer for a bit to allow you to wheel and deal and to arrange for the future. In the second case, even in the case of a parliamentary coup like the 9th of Thermidor, the most important thing is to act fast.