The self-described "relentlessly positive" head coach had a theme to push - the opening of training camp was a "rebirth" - and questions about his right guard's dissatisfaction with his contract weren't going to interfere. The 49ers' running back wasn't on the field Thursday afternoon for the first practice of training camp after he was placed on the non-football injury list last week. Before practice, Harbaugh said Lattimore was placed on the list because of two issues: his surgically reconstructed knee and a hamstring injury he sustained during the offseason program. "The trainer, doctors evaluate and make those decisions as an organization, and we do what's best for the member of the team, the youngster," Harbaugh said. Because ultimately that's in our best interest.