He isn't a good pass rusher but from a "production" standpoint Patchan wasn't far behind Garvin and Hill.
We would probably be fine without him since we have Rousseau, Phillips, Harvey, Cam, Chantz, Q. Williams
Garvin: 37 tackles / 9 TFL / 5.0 sacks
Hill: 27 tackles / 9.5 TL / 4.5 sacks...