NASHVILLE -- A few thoughts on the San Francisco 49ers' 31-17 victory against the Tennessee Titans.What it means: The 49ers are rolling. They have won four straight games after starting 1-2. With the 0-7 Jacksonville Jaguars on tap next, the 49ers have a great opportunity to be 6-2 at the bye. They still trail the Seattle Seahawks, 6-1, in the NFC West. But the 49ers look like they are in this race for the long haul. This was an impressive, complete win against a tough team on the road.