How Tight is the QB Leash? Or is Schaub Just Too Conservative?

[Nconroe]

now NBC lets you choose some interesting QB statistics,
http://scores.nbcsports.msnbc.com/fb...e=NFL&rank=098

such as first down% on third down by passing where Schaub comes in at 15.

%First Downs, Pass on 3rd Down
Rank Player Team Stats
1 Matt Ryan Atl 49.4 ( 79/160 )
2 Peyton Manning Den 49.0 ( 74/151 )
3 Tom Brady NE 48.0 ( 72/150 )
4 Ben Roethlisberger Pit 47.6 ( 59/124 )
5 Matt Hasselbeck Ten 47.1 ( 32/68 )
6 Aaron Rodgers GB 45.8 ( 66/144 )
7 Matthew Stafford Det 45.5 ( 91/200 )
8 Tony Romo Dal 45.3 ( 73/161 )
9 Michael Vick Phi 45.3 ( 43/95 )
10 Drew Brees NO 44.5 ( 77/173 )
11 Russell Wilson Sea 43.2 ( 54/125 )
12 Andrew Luck Ind 42.9 ( 73/170 )
13 Ryan Fitzpatrick Buf 42.9 ( 60/140 )
14 Philip Rivers SD 42.6 ( 66/155 )
15 Matt Schaub Hou 40.0 ( 56/140 )
16 Christian Ponder Min 39.7 ( 60/151 )
17 Alex Smith SF 39.3 ( 22/56 )
18 Matt Cassel KC 39.0 ( 30/77 )
19 Cam Newton Car 38.2 ( 47/123 )
20 Eli Manning NYG 38.0 ( 52/137 )