Six months before the season is set to start, St. Louis Rams backup quarterback Brock Berlin is the odds-on favorite for most likely third-stringer to see action.

Berlin sat behind Marc Bulger and Gus Frerotte in 2007. He played in one game last season. But the Rams Monday inexplicably not only signed Trent Green to become the fragile Bulger’s primary backup. They also reportedly gave the concussed one $8.9 million for three years – including a $2.1 million signing bonus.

Frerotte, who once sprained his neck head butting a brick wall, shows admirable durability compared with this duo. Bulger, when healthy, is a top eight NFL quarterback, at worst. But he has missed 12 games in three seasons and Green, with two horrendous looking concussions that left his career temporarily in doubt, has played just 13 games the last two years.

So if I were Berlin I’d make sure I know the playbook.