It shouldn't
I think Richardson from the Jets has a good shot to win it. He has 3.5 sacks (keep in mind he plays DE in a 3-4 scheme), he's been great against the run which doesn't always show up as flashy as sacks do on the stat sheet.
I really hate to use stats to talk about/compare D-lineman since it doesn't even tell half the story (especially between a 3-4 DE and a Wide 9/4-3 DE), but here they are...
Richardson
12 games
64 combined tackles (36 solo, 28 assist)
3.5 sacks
(ESPN stat?) 12 Stuffs for -25 yards
1 FF
Ansah
10 games
24 combined tackles (14 solo, 10 assist)
7 sacks
1 stuff for -3 yards
2 FF