Total QBR: Manning stays on top

A look at the AFC West Total QBR leaders through Week 15:

1. Peyton Manning, Denver

Total QBR: 81.5

NFL rank: 1

Comment: Manning keeps on plugging away.

2. Carson Palmer, Oakland

Total QBR: 44.6

NFL rank: 29

Comment: Palmer needs to find the end zone more.

3. Philip Rivers, San Diego

Total QBR: 38.0

NFL rank: 31

Comment: The nightmare continues for Rivers.

4. Matt Cassel, Kansas City

Total QBR: 36.5

NFL rank: 33

Comment: Brady Quinn still hasn’t qualified for the season rankings, so Cassel’s horrible numbers stand.