Don't blink, free agency moves fast -- and it hasn't even started yet.Tuesday morning we looked at potential replacements for the San Francisco 49ers' top options. In the meantime, the alternatives should kicker Phil Dawson go elsewhere have begun to dry up. The Colts agreed to bring back Adam Vinatieri, there have been reports Josh Brown is close to re-signing with the Giants and Dan Carpenter is about to head back to Buffalo.That means there may not be many good options left for the 49ers if Dawson leaves.