Re: The Master and The War Chief - Why can't they be the same guy?
I think part of it comes from the fact that in The War Games
The Doctor doesn't seem to know or recognize The War Chief as anyone beyond being a Time Lord, whereas it's established during The Third Doctor era (particularly in Terror of the Autons
and The Sea Devils
) that The Doctor has known The Master for a long time.
"Eccleston was a tiger and Tennant was, well, Tigger. Smith [is] an uncoordinated housecat who pretends that he meant to do that after falling off a piece of furniture." - Lynne M. Thomas
"I'm in Hell and it's full of Avons!" - Vila