The whole league adjustment league is completely overblown. Yes it affects ERA, because the AL has a DH. It shouldn't affect wins. When an NL pither switches to the AL, it's not like the other pitchers aren't also pitching to DH's. They are on a level playing field with pitchers in their own league. Are you assuming that AL pitching is superior to NL pitching? If so, on what are you basing that conclusion?