SUTHERLIN — Cameron Mock and Beau Grauf are going to make it difficult for the Sutherlin High football coaching staff to keep its word. The senior running backs weren’t supposed to be the whole show going into this season. The Bulldogs planned, at least, to work another dimension into their offense after feeling they had been held back the last couple years by their predictability. That was before they stepped onto the field and began providing reminders of their capabilities. Friday night against Coquille was another one, when Mock and Grauf accumulated 259 rushing yards on 25 carries, knocking down …