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

[Nconroe]

Then ESPN has their QBR rating where Schaub comes in at 13
http://espn.go.com/nfl/qbr

2012 Regular Season NFL LeadersRK PLAYER PASS EPA RUN EPA SACK EPA PEN EPA TOTAL EPA ACT PLAYS QB PAR QB PAA TOTAL QBR
1 Peyton Manning, DEN 116.6 1.4 -14.1 12.9 116.8 691 144.4 87.0 84.1
2 Tom Brady, NE 114.3 3.1 -16.6 8.3 109.2 739 129.0 67.6 77.1
3 Colin Kaepernick, SF 45.5 15.2 -11.8 -2.5 46.4 316 54.8 28.5 76.8
4 Matt Ryan, ATL 122.2 12.1 -25.4 5.5 114.4 717 117.6 58.1 74.5
5 Aaron Rodgers, GB 108.9 19.1 -39.0 13.8 102.9 726 113.4 53.2 72.5
6 Robert Griffin III, WSH 80.2 12.7 -20.3 7.4 80.1 589 89.6 40.8 71.4
7 Alex Smith, SF 41.7 3.7 -13.4 2.5 34.5 295 43.5 19.0 70.1
8 Russell Wilson, SEA 86.4 23.1 -27.4 6.2 88.2 588 85.6 36.8 69.6
9 Drew Brees, NO 108.0 -0.1 -20.0 -1.4 86.4 761 106.1 42.9 67.9
10 Eli Manning, NYG 74.0 1.2 -12.2 8.4 71.5 628 86.6 34.5 67.4
RK PLAYER PASS EPA RUN EPA SACK EPA PEN EPA TOTAL EPA ACT PLAYS QB PAR QB PAA TOTAL QBR
11 Andrew Luck, IND 73.4 21.1 -24.4 19.3 89.5 778 100.9 36.3 65.0
12 Ben Roethlisberger, PIT 88.8 5.3 -29.0 4.3 69.4 537 65.8 21.2 62.8
13 Tony Romo, DAL 120.4 1.2 -31.1 1.1 91.5 779 95.3 30.7 62.7
14 Matt Schaub, HOU 78.6 -1.2 -21.3 5.0 61.1 637 77.6 24.7 62.6
15 Matthew Stafford, DET 90.5 5.2 -21.1 7.8 82.4 846 93.3 23.1 58.9
16 Cam Newton, CAR 51.0 27.1 -26.7 4.4 55.8 698 66.9 9.0 54.2
17 Christian Ponder, MIN 44.2 7.9 -21.2 8.0 38.9 611 57.7 7.0 53.8
18 Josh Freeman, TB 65.1 2.8 -21.4 3.6 50.2 681 63.0 6.5 53.1
19 Ryan Tannehill, MIA 55.0 4.5 -24.2 10.8 46.2 624 56.1 4.3 52.3
20 Jay Cutler, CHI 39.9 16.4 -23.3 4.0 37.0 559 49.6 3.2 51.9