Passing yards won't tell you anything about how good a QB anyone was in college, or what their pro potential was because the balance of run and pass has varied so greatly over the years at different schools.
I can think of three old Alabama QBs who wouldn't be anywhere near that list: Bart Starr, Joe Namath and Snake Stabler.
And yet the winningest Bama QB of all time, Jay Barker, did nothing in the NFL.