On a crisp evening at Hooper Stadium, Granite Bay showed why it is the 2012 Sierra Foothill League champ and why Nevada Union still has a lot of work to do if it finds its way into the playoffs. The Grizzlies (7-3, 5-0 SFL) controlled the game from start to finish and never trailed on their way to a 38-7 victory over Nevada Union (5-5 2-3 SFL). “They’re a heck of a team,” NU head coach Dave Humphers said. “We made a couple of mistakes, and they were very, very good on defense, and that gave their offense a lot …