You know these folks well. They can’t name Eli Manning’s back-up, or don’t know that Darian Thompson went to Boise State. Yes, they are New York Giants fans for sure, but won’t break out of casual fandom until they do some offseason studying.
Casual fans are why one has to take greatest ever lists with a grain of salt. First, these lists tend to favor current players. After all, nothing of importance happened before some of these folks were born. Second, casual fans do not generally account for the nuances of the game over time.
Accounting for the nuances becomes especially important when addressing the quarterback position.