FRISCO -- Cowboys linebackers coach Matt Eberflus said he's looking forward to hitting the reset button Sunday at San Francisco.No, he's not talking about scrapping everything with wholesale changes in the middle of the Cowboys' defense. But he's excited to finally have Sean Lee and Anthony Hitchens ready to play in the same game for the first time all season.That means Jaylon Smith will now take a back seat.Hitchens will start at middle linebacker against the 49ers, with Sean Lee back after a two-game absence because of a hamstring injury and ready to run the show again on the weak side.The Cowboys are hopeful that reuniting Lee and Hitchens will tighten up their porous run defense.Lee's and Hitchens' play alongside each other a year ago was a big reason the Cowboys finished with the league's No.