Just out of curiosity, if Microsoft sells CoD, the IP, but keeps all of the studios and tech, wouldn't they retain most of the sales numbers? Like a Harvest Moon/Story of Seasons type rebrand.
They wouldn't be allowed to do that under behavioural remedies for the acquisition. If they are forced to divest, even if it's only CoD, it's been established that it would be everything related to the franchise, including studio(s).