What Is The Single Most Important Ingredient For Success In The NFL?

In this week's edition of our ongoing series of things to talk about when there is absolutely no Texans news to talk about offseason discussion topics, I ask you: What is the single most important ingredient to achieve success in the NFL?

I reckon the immediate response of many to that query will be a resounding shout of, "QUARTERBACK!" Indeed, that may well be the case. But perhaps you believe there's something else that's more important, given the success of teams that featured Brad Johnson and Trent Dilfer at quarterback.

Head coach? Scouting department? An owner who hires people and lets them do their jobs without meddling? A general manager with a keen eye for matching players to scheme? J.J. Watt?  Something else?

Let your answer rip and then explain yourself in the Comments.