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Therefore I think you have to try and compare Chavez against other players from outside the US (not Japan) to get a better comparison.
Using CAREER numbers when comp'ing minor leaguers is always a dicey way to go about it. When you're comp'ing American to international (young) minor leaguers, you're completely losing the thread.
Nothing against Roto Champ. I don't go for the method here, though.