Rivers wasn't as bad as his last season might look. He's not mobile. At all. Had a great game the one time he had a functional left tackle (Okung) against Green Bay. The rest of the season he didn't have a left tackle or a right tackle who could pass protect. Watch some highlights of last years Raider game if you want any indication. Line last year was horrid. The project left tackle rookie (Trey Pipkins) couldn't block anyone. The right tackle (Trent Scott) couldn't block anyone and then the center got hurt. He still managed to make games competitive and avoided another 20 sacks.