The QB position probably has the starkest difference between college football and the NFL of any position on the field. Unless you play in a pro-style offense in college, you are not likely to be a top NFL quarterback.
For every John Elway or Payton Manning out there, you'll find dozens of Johnny Manziels, Tim Tebows, Charlie Wards and Doug Fluties. And whatever happened to Danny Wuerffel, by the way? :-)
Danny sells cars in Gainesville.