Whether they’ll remain this way after they face an expectedly tougher offensive schedule than the one they’ve seen over the first six weeks remains to be seen, but the Seattle Seahawks have set themselves up for higher expectations with a mostly-dominant performance on defense to open the season. Much of that success over the first five games was generated by forcing turnovers that helped stop some bleeding on third downs, but Sunday’s 27-3 win over the Oakland Raiders was the...