This is a bit of a problem on the career level, but much more so at the level you are suggesting.
For pitchers, you really can't do what you're talking about, as nobody with a major league managing job would have used Inao or many other pitchers the way they were used in Japan. I made the judgement that they would have been used less per season, and would have gained longevity. That means some of the innings from the best seasons are effectively being moved to later seasons. Over a career I can justify this, but not on an individual season basis.
Nomura has such longevity at such a difficult position that he doesn't need any help. Carter, Fisk, and Bench look very similar. I really can't think of a NPB hitter who played so well at his peak to be seen as Cooperstown material, but then slowed such that he fell short other than Nakanishi, and you can't ignore the injury out of existence in my view. If you do, then we have to talk about Chapman, Conigliaro, and Chino Smith of the Negro Leagues, and probably at least a dozen more - and they're all going to be cases of "what if" but for the injury or illness. It's tough enough to talk about what these guys did accomplish, especially those outside the majors, without getting into such discussions. Maybe the wartime guys get a little shortchanged, but I'm not convinced of that.
Besides, right now I've got a list of sixteen players who I'd vouch for, which is quite enough. This is especially true since none of them, not even Oh, has a snowball's chance in Hades of getting into Cooperstown any time soon. Heck, I'd rather get the issues of defense and park effects in NPB better nailed down before even thinking about this one - and I don't even have the data for either of those.
I think your premise is correct, but applying it accurately is most difficult. I think the short answer would have been that doing what you suggest really pushes the adjusted data beyond the level at which I am comfortable with the results.
Jim Albright
I'd go with the first three on performance alone; and Sawamura as a historical figure.
Of course, other guys, like Harimoto, Kaneda, and Starfin are worthy, but I'd vote for the four guys above first.
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Jim Albright