Alexander Hamilton wrote in Federalist 51 that if men were angels, no government would be necessary.

Call the following Plummer's Quandry: if all men were Unitas, coaches would not be necessary.

As Malcolm Gladwell puts it:

Speaking of which, how fascinating was the Plummer meltdown in the Pittsburgh game? People have been beating up on Plummer, saying that his true colors emerged in that game. I prefer to look at it the other way. Shanahan managed to put in place an offensive system so brilliant and so precisely tailored to his quarterback that he could make Plummer -- Plummer! -- look like a great quarterback for 17 consecutive games. That's pretty remarkable. The Plummer story is not about the frailty of individuals. It's about the redemptive power of environments.

Read the whole interview. It's excellent.