And there's the fallacy of your argument. You apparently have blind faith in the validity of OPS+. Just as you do with WAR. And UZR. And all the other new-age stats.
I look at OPS+ and say "Bernie Williams = Rick Monday?" Even when adjusting for ERA, I have to say "Um, no". If OPS+ says they're comparable, then maybe there's a problem with OPS+. Critical thinking gives OPS+ a cold, hard slap across the face.
I watched a lot of baseball in the 70's. I saw a lot of Rick Monday. I saw a lot of Bernie Williams in the 90's and 00's. To try to imply that they were comparable players within the context of their respective eras is laughable.