Greene (knee) gained 15 yards on six carries in Saturday's preseason game against the Falcons. Greene did nothing against a weak Atlanta defense, but the bigger story was Bishop Sankey's complete lack of involvement with the first-team offense. Dexter McCluster worked ahead of Sankey, and Leon Washington got some snaps as a third-down back. Of course, neither McCluster nor Washington is a threat to handle anything close to an every-down role, meaning Sankey still looms as the primary threat to Greene's value. Greene's lack of quickness and receiving ability puts a pretty low cap on his ceiling, while Sankey's presence means the veteran also has a low floor. According to The Tennessean, the Titans are happy with Sankey's running and receiving, but worried about the rookie's propensity for fumbling in practice. Greene will very likely enter Week 1 as the starter, but his job security is poor.