Why Adrian Colbert needs a strong showing to make roster

With Tarvarius Moore locking down the starting free safety role and both Jimmie Ward and Antone Exum playing well, Adrian Colbert is now firmly on the 49ers roster bubble in need of a strong showing against the Chargers.

Just a year ago, Adrian Colbert was sitting pretty with a lock on a starting safety job for the San Francisco 49ers. Now, one year later, he sits firmly on the roster bubble, and things only continue to look worse for him.

The shift of Tarvarius Moore to free safety provided new competition for Colbert, competition which had been prolific at the position in college. Rightfully so, Moore outplayed Colbert in practice, earning the majority of starting reps. Things only got…