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Although I get intuitively why Neville Chamberlain wouldn't really come into this discussion, it seems odd to me given how the concept is described here that he isn't mentioned. "The main powers among the Allies of World War II, and their respective leaders", well, the UK was a main power, and Neville Chamberlain was its leader (for a short time) during the war.
To be honest I don't know what the solution to this is. Maybe just a term like "their major respective leaders" or something? Or just a less "definition-based" definition, like "The Big Three is a term used to denote three leaders of the main powers among the Allies of World War II [etc.]".