Board Thread:The Panopticon/@comment-4028641-20151008023030/@comment-6032121-20191106213132

Danniesen wrote: it was a body swap. …a what? "Body swap" usually assumes that Mind A goes into Body B while Mind B goes into Body A. This isn't what happens with the Beevers-Ainley "regeneration" at all: the Mouldy Master somehow merges with the body of Tremas, resulting in the creation of the Ainley Master, who doesn't look quite like either. Where that leaves Tremas's mind is anyone's guess, but it sure doesn't look as though it ends up in any version of the decayed body previously inhabited by the Master.

And while it's not a standard regeneration, Beevers-Ainley is called a regeneration by several sources.

I also don't see how the Basil Rathbone Master wouldn't count as a regeneration. He regenerates thanks to stolen Tzun tech rather than good old Gallifreyan regeneration energy, but regeneration is what it is; as you can see from the article Regeneration, it's not without precedent that other species in the universe regenerate in their own slightly distinct ways. It's nothing of a body swap either, at any rate.

With all that said, I don't think we should worry overmuch about these potentially-unreliable, extremely-up-to-interpretation Missy quotes.