Many decisions make barely sense from the hardly properly informed outside view.
Some stuff seems to be outright bonkers, but might be backed up by some numbers and or sometimes I can imagine just personal relationship were top or lacking. In the case of Tango relations might have only existed with Mikami and no one else in the remaining force was given a chance to follow him even though they might have had reasonably success with HiFi Rush.
Not fun for employees to be fired for dumb reasons, but as long as they are not themselves invested, it is just a job, no lifelong promise. Those who are invested, the studio founders, usually take those acquisition deals and the buyer drives the studio in the ground, making the loss. So whatever. Real talent will usually respawn.