San Francisco 49ers: 10 Starters Who Might Not Make the 53-Man Roster in 2016

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Oct 22, 2015; Santa Clara, CA, USA; San Francisco 49ers cornerback Kenneth Acker (20) intercepts the ball against the Seattle Seahawks during the third quarter at Levi’s Stadium. The Seattle Seahawks defeated the San Francisco 49ers 20-3. Mandatory Credit: Kelley L Cox-USA TODAY Sports /

No. 4: Cornerback Kenneth Acker

Cornerback Kenneth Acker, in his first fully healthy season, started a total of 13 games last year before falling out of favor and winding up in a backup role.

Over that stretch, Acker posted eight passes defended, three interceptions and had a minus-0.3 overall grade, per Pro Football Focus — signs suggesting Acker has a good deal of talent but isn’t exactly worthy of being a top-tier player anytime soon.

The 49ers likely want Acker to continue his development. But, as mentioned with fellow corner Tramaine Brock, there is more than enough competition here.

Let’s go ahead and assume Brock and fellow defensive back Jimmie Ward occupy the Nos. 1 and 2 spots on the depth chart. And the 49ers aren’t going to be parting ways with cornerback Dontae Johnson or rookies Will Redmond or Rashard Robinson in all likelihood.

One has five cornerbacks right there. And there are more than a few others, including Acker, vying for a roster spot heading into the regular season.

Acker could be seen as the favorite out of the remaining cast. There isn’t anything wrong with that. But, if someone like Keith Reaser, Marcus Cromartie or Prince Charles Iworah showcases even more promise than Acker has right now, the third-year pro could wind up calling someplace else home in 2017.

Next: S Antoine Bethea