It was a rough first season for Mike Shanahan in Washington, but there were plenty of signs that his offensive system can work with the Redskins. At receiver, Santana Moss had arguably his best season as a Redskin at age 31, and Anthony Armstrong came out of nowhere to put up 871 receiving yards. TE Chris Cooley tied his career high in receiving yards. RB Ryan Torain showed signs he could be a No. 1 back if he can stay healthy. And all this with QB issues and very spotty blocking up front. Quarterback clearly is the most concerning position heading into the offseason, but the line also is one area that is sure to see a lot of changes. OLT Trent Williams, despite being a little up and down, has shown he can be an anchor along the Redskins' front. But there could be new starters at perhaps three positions up front, with both OG spots being the most likely spots to change.