I don't think the comparison is as straight-forward as you make it seem. Opponent/strength of schedule, team injuries, etc. all play a role as well.
Sure, but what has remained constant is that in the NFL you simply can't afford to turn the ball over as much as Jay Cutler does. McCown didn't. I get it, the OLine is at fault and the wideouts are at fault and the D can't stop anyone and the O Coordinator sucks. But Jay still turns the ball over too much. I also get it, I'm just a "Jay hater." But Jay's own receiver is saying it. Maybe he's just a Jay hater too, I guess.