The dialogue was written so it is ambiguous!! 'Maybe I was you" , 'Or maybe you are me". "Or maybe it does not matter either way" . Just another Moffat nugget for fans to argue about. LOL
I was trying to remember the quote. It was whimsically ambiguous and I don't have a problem with that.
After all, Who knows?
The dialogue was so perfectly Tom Baker that after I had picked my jaw up off the floor I was grinning from ear to ear. Personally I'm going with he's a future Doctor who has retired. Every few centuries he pops over to Karn for a pick me up regen elixir.
