I wonder how much of this is ARod and how much a reflection of how NFL offenses have changed in recent decades. Right now ARod's TD-to-INT ratio looks like a complete outlier among the historical elite of NFL QBs (30% better than his closest competitor), but that's in comparison to guys who for the most part started their careers a decade or more earlier. Of the 20 best single season TD:INT performances in NFL history, 18 of them have come in the last ten years. Ten years from now, when guys like Derek Carr get added to this list, things might look a little different. ARod will still be elite in this department but the gap probably won't be as huge as it is today.