The regeneration from Baker to Davison was odd; maybe he's going to say it wasn't a real one.
How was it odd?
I saw that episode way back in the late 80s. I have never seen any other "regenerations", so I don't know what they are normally like. How did the Baker/ Davison regen differ from the others?
Weird entity called the Watcher merged into him to create Davison. The rest (the ones they showed at least) were just straight changes, though different SFX each time over the years.