Niners Have Big Decision to Make on Mike Iupati

Once the 49ers hire a new head coach, the team will face some tough roster decisions.And it's possible that the new coach may provide some input into the discussion about which unrestricted free agents to re-sign or let walk.Take left guard Mike Iupati, for instance.Iupati, who just completed his fifth season with the 49ers, is one of 15 unrestricted free agents on the San Francisco roster. He's among five – along with wideout Michael Crabtree, running back Frank Gore and cornerbacks Chris Culliver and Perrish Cox – high-profile, high-impact players on the list.Iupati, just named to another Pro Bowl, has been a big part of the San Francisco success story since 2011. He's been hailed as one of the best run-blocking guards in the NFL, and he's a huge (6-foot-5, 331-pound) and agile athlete who can pull and get outside the tackles to spring running backs for big gains.Niners running backs coach Tom Rathman has said he doesn't "think there's any question" that Iupati is one of the best guards in the league."You look at how big he is," Rathman said. "He can cover up a defender and he can get movement on him. That's the biggest thing."With an offense built around a power...