LOL! Wonderful! As best I can remember Two, it sounds just like him, in such a short space. Is that the first time Methos met the Doctor? I know you told me once, but I don't remember.
Yes, he had met Nine previous to "Friendly Drink", at least once before. I'm not going to have it that Methos can recognise the Doctor no matter what he looks like; Methos isn't a Time Lord, he doesn't have that ability.
This series has a very tangled chronology; I haven't worked it all out yet. At some point, yes, Methos is going to find out about regeneration, but I'm not sure when the best time for that is.
This story here is certainly the first (and probably only) time that Two and Methos have met. I would like him to meet all of them, but I haven't figured out how yet.
It's my intent to have Methos meet all of the Doctors, one way or another. And after listening to the 2nd-Doctor story "The Abominable Snowmen" I realized that his earlier journey referred to in that story, would be a good time to set this particular meeting. And give me a chance to have the 2nd Doctor say "Oh dear" (which is very him. 8-)
It's a bit tricky to decide what to do about the existence of both; I've taken a quick look and there's a lot of duplication of posts as far as fic-posting is concerned. But I don't really want to have to join both, because my time is limited.