You know, I don't believe that W/L is always a good stat for QB's, because there can be such a vast difference in talent, like the Raider and Bills. Let's say the Bills go 9-7 or 10-6 with EJ with those numbers. Sure a .8 drop in completion percentage, whatever. With 6 or 7 more wins, QBR rises. That would be progress.
Even if you hold fast that it isn't, Carr is still at a better point now than EJ is now, so this tangent is a little unnecessary.