I voted 11-15, based upon the hope - however slight - that Mankins returns, and upon the success enjoyed during the '08 season, when Bill & Dante & the OLmen knew that they had to run to have any chance of keeping Cassel healthy & productive.
If Mankins leaves, and Bill displays no confidence in LaMa, and the offense loses patience early in pre-season games (e.g.: empty-backfield shotgun formations on 3rd/< 3 yards), then this becomes a 16-20 unit, at best.