If he got 4 sacks he'd be doing great.
Although I think we may see him lining up in a number of places on the Dline, so perhaps he'll have other opportunities.
6 sacks is REALLY huge for a NT. Part of the reason especially in the NFC West is to stay at home, clog the middle, and be a spy to make sure that the likes of Russell Wilson and Tyler Murray don't take off out of the pocket up the middle. I imagine he'll be coached to get a good push, with the job to occupy, not shed, blockers and make it easier for others to go after the QB.