Derek Carr often offers a simple, gift-wrapped explanation for the Raiders’ offensive or team struggles. He fell short, the franchise quarterback says. Blame him. Ignore the imprecise routes, which often muddy the timing and effectiveness of throws in critical situations. Ignore the 32 dropped passes, second-most in the NFL. Ignore the interceptions and three-and-outs those miscues have caused. Ignore the occasional inability to separate from man coverage. Ignore the increasingly frequent lost fumbles after a catch, from none in 2016 to an NFL-high six this season. These errors, visible and disruptive, go unmentioned. “You can put it all on me,” Carr said after last Sunday’s loss to the Kansas City Chiefs. “Don’t you blame one coach, one (other) player. It is all my fault.” There is just one problem with gift wrap: A couple of rips reveal what’s hidden. Despite offering ownership, Carr is not the source to all the Raiders’ problems. If only they were so simple. On Monday, coach Jack Del Rio stated an overall team need to play more “boldly” and “let it rip.” It’s unclear if such swagger is a realistic culprit, either. The main devil in 2017 might be the aforementioned details, a component the offense hopes to refine Sunday evening against the Dallas Cowboys. To solely fault Carr is equally convenient as it is incomplete. The shortcoming is shared, including among the receiver corps.