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The NL matters as far as the ability to judge starting pitching in that they get to face the pitcher several times a game. You have to account for that in their ERA and hits totals. 2-3 auto outs a game can be significant over the course of 200 innings. It makes no nevermind whatsoever to a closer like Franklin, because he's NOT facing a pitcher. Lineups are not weaker in the 9th between leagues, and having an abundance of pinch hitters makes NL bullpen matchups harder on NL bullpen arms, actually.
I know Matt's not a believer in NL talent, but for Franklin the situation should be basically neutral between leagues, certainly not like facing AAA.
~G