Nothing really supports this...
Passer rating:
Shapen 146.91
Manning 140.38
QBR:
Shapen 57.3
Manning 58.6
Yds/att:
Shapen 8.2
Manning 7.7
Comp %:
Shapen 67.0
Manning 60.3
Td%:
Shapen 4.9
Manning 6.3
Int%:
Shapen 2.7
Manning 2.6
Rushing per att, tds:
Shapen 0.3, 1
Manning 3.3, 5
I say they're basically equal, which is reflected by passer rating and qbr.
Now one is terribly overpaid

