They saw the value of the Mini brand and didn't want to put a BMW badge on a lower end car, so they held onto it when they jetisoned the rest of the Rover group. The RR brand is selling to different customers than the BMW brand is. But I don't see that BMW would need the Tesla brand, there's too much overlap there IMO.

BMW bought the brand rights to Rolls Royce for 120 million EUR. BMW will not buy Tesla at anything above a eighth of their current stock price.

Not really. They merged with Rover and bought Rolls-Royce in the 90s. At the time the BMW management wanted to expand. Mini is a holdover from the Rover merger. This merger is largely seen as a failure and BMW divested from all Rover brands (except Mini). For more than 20 years BMW has not expanded.

It's quite possible something similar to the Fisker bankruptcy might happen - Fisker's assets were bought out by Wanxiang Group who then launched Karma Automotive, resuming manufacture of their 'Revero' plug-in hybrid car, which is an improved version of the old Fisker Karma.

didnt fisker just announce partnership with rimac and pinifirina

yes fisker retained the name but not the karma