Now, that can usually be mentored, if the team has a reasonable intelligent QB(not counting JaMarcus Russell), and a decent quarterback coach. Usually though the best mentor would be a veteran successful QB. If Elway didn't have his head up his ass, he would know he had the winning cards right there in his hands-- Tebow, being mentored by Manning as a starter.
I guess a person could now say that Elway is proof positive that being a good quarterback in the NFL does not require any minimum intelligence quotient.