We may not "need" McCoy to win but if you're trying to say we can plug about anyone into his spot and get close to the same result you are delusional.
What your stats don't have factored in is his receiving ability. What everyone else is able to do, how they face less pressure when he is out there. His experience, leadership. Place a "stat" on that. How about being a true home run threat...I don't have a "stat" handy...but I doubt we see Tolbert bounce to the outside and ripoff a 60 yard run. Just the ability to have that on the field is a game changer.