It was always clear C-Levels are supposed to stay for a limited time to ensure smooth knowledge transfer. Hence the retention bonuses baked into the acquisition.
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As soon as the previous DLC had a 45% revenue drop, many of them bailed because they already knew they weren't going to get a dime. Those bonuses were to be paid out over 3 to 5 years, if I remember, but they did not ever meet those goals. No one is going to work for a company knowing they have no chance at a bonus.