Hi Tech said:
"Early mid and late are relative terms. As things are split up now, it's generally a mid period of mid 42 to early 44 with early and late being outside of that. As with many things, I'm sure this will evolve over time."
No P-47 saw combat before before mid 42 nor a D-25 in early '44, so I don't think we'll see the D11 in the early war or D25 in the mid war arenas unless the dates "evolve" on the early/mid war arenas.