SANTA CLARA, Calif. -- The San Francisco 49ers' offensive line is, once again, intact and it played at a high level Monday night against Atlanta.Left guard Mike Iupati returned to the lineup after missing four games with a knee sprain. Offensive coordinator Greg Roman said Iupati had a strong night in his return."Good. Really good. Did really well," Roman said Thursday when asked about Iupati's play against the Falcons. "He was on it from an assignment standpoint and physically as well.