I definitely think that the "Incarnations of the Doctor" category needs to be split between the widely accepted, unplaced and ambiguous. It is overcrowded as it is, the main incarnations should be separated from the rest with much urgency.
As I stated there's nothing yet linking the Morbius Doctors to the Other, but there is a set placement given for them in the current show. If the Timeless Children are considered to be unplaced incarnations of the Doctor, and the Fugitive incarnation is also, then the Morbius Doctors (who were strategically placed between them) should be too. There is also no evidence whatsoever to the Season 6B fan theory.