If you keep Josh performance today as a constant, you could have taken the starting offense from any other NFL team, and subbed those guys in four our guys today, and got pretty much the same result. Keep everyone else as a constant and substitute in any other QB, its not clear you get close to today's result. Its not all Josh in the sense there are 10 other players on offense. But in the sense the outcome is far more dependent on Josh than the rest of the offense combined, it is "all Josh" in that sense.