I have a theory that The Morbius Doctors did take place Pre-Hartnell, and the other cycle of regenerations were only 8 regenerations. And as The Timeless Child could of been only 7. I’m saying this because people like Rassilon lived for millions of years he had to have more than 12 regenerations too. The Timelords hide a lot of stuff, but also just imagine how much creativity could come out of all The Doctors missing regenerations damn