‘Pleased as he was to see his once-porous defense contain the run-happy Kansas City Chiefs in last weekend’s opening 41-7 victory, Gailey acknowledged the Bills’ home opener against the Raiders on Sunday will be a far more daunting challenge. “They’re so massive up front and their backs are big and strong and (run) downhill,” Gailey said. “Last week, it was edge, hitting the crease, dip, dart. This is right at you: ‘Here we come. See if you can stop us.'”‘