Snap judgments: Gone from 49ers

Our series on 2012 contributors gone from NFC West rosters concludes with a look at the San Francisco 49ers.

2012 49ers Gone from Roster

Players responsible for logging 85 percent of the 49ers' offensive and defensive snaps last season remain on the 90-man roster at present. That is a high figure, but it's also telling only part of the story.

Receivers Michael Crabtree and Mario Manningham remain on the roster, but neither is healthy enough to contribute. Crabtree could miss most of the 2013 season. Manningham might be ready for training camp and it's unclear what plans the team might have for him when he does return.

With Manningham and Kyle Williams returning from injuries, and with Crabtree out, second-year receiver A.J. Jenkins is the only fully healthy wideout returning from last season. The team will lean heavily on newcomer Anquan Boldin while developing rookie Quinton Patton and Ricardo Lockette, who spent last season on the practice squad.

Tight end and the defensive line are two other positions to watch from a personnel standpoint.

Rookie second-round choice Vance McDonald projects as the likely No. 2 tight end after Walker signed with Tennessee in free agency. The 49ers could also expand their rotation along the defensive line.

The first chart shows 2012 offensive and defensive contributors no longer with the team. The second chart provides some context relative to the division. The 49ers' percentage returning at running back is second highest for any position in the division.

Percentage of 2012 Snaps Remaining on Roster as of June 18, 2013