Terence Newman: Arguably been the best/most steady corner for us all year which is good but kind of scary considering he is 37 and likely done this year or next. So as good as he has been who knows if he will be here next year and who knows what 38 looks like for him if he does decide to return. Also has only Picks on team for CBs (2).
Xavier Rhodes: Coming into this year Rhodes was starting to get a lot or praise and notice from around the league as a top CB however this season has been bumpy to say the least. Rhodes has been torched on numerous plays and has been noted by officials as a "holder".
I haven't lost faith because of a bumpy season I believe Rhodes can rebound and play well however once officials start to get a reputation about a player it is hard to shake and I am concerned the reputation and unwarranted flags will negate how good he could be. I guess he needs to strap on the boxing gloves and fight for his reputation back, one practice at a time

Josh Robinson: This one is short and sweet, hasn't played this year and hope he doesn't. Never been a fan of Josh Robinson and don't think he has what is takes to be a starting CB in the league.
Captain Munnerlyn: One player I have been pretty shocked about and might be one of the most improved from last year imo. Captain had a rocky start to last season but started to find a rhyme with a position change. This year I think Captain has played great, he makes nice reads on running plays and is quick to support, and is usually in decent to good coverage on passing plays. I think Captain is a good piece going forward for our CB core.
Marcus Sherels: Don't know what to say about this kid, love him. Such a reliable catcher and punt returner and often clutch when we need him. He isn't a starting CB imo but is a special team player with huge impact. He can return a punt with the best of them and cover kicks/punt nearly as well. I say we keep him for special teams however I don't believe he benefits or improves our CB core.
Trae Waynes: Our rookie first round pick, very athletic and quicker than Marshawn Lynch trying to get to his bag of skittles before Eddie Lacy finishes them. Yet to see to much of him play, granted when forced into the chance he has played well/decent. Hard to say yet what type of potential if any he brings to our core but will be interesting to see play out into maybe later this season or next year.
So of our 6 current CBs we have two (Granted Rhoades cleans up his play) decent/good CBs, one who may not return, two more I believe cant deliver the goods and one question mark. It may not be as big of a weakness as I may be making it out to be but I believe a CB should be drafted by the 5th round at the latest and maybe even another one after.