Personally, I'm done with all of them: Church, Wilcox, Mo, and Carr...particularly Carr. His body language reminds me of Newman in his final seasons.
That being said, starting Sunday - no more excuses for this secondary. Sunday they'll have the entire front 7 healthy and causing chaos in front of Eli. It's about damn time we see these guys cause some turnovers. They have one interception on the season. 2 total for the defense, only the London/Jacksonville Jaguars have less. The Broncos have 3 interception TOUCHDOWNS - Dallas native Aqib Talib has 2 TDs on his own. He's getting paid like Carr and actually earning his money.
When the ball is thrown at you, catch it. Show some instincts and confidence by jumping a route or two. Safeties need to be ballhawks...when Eli throws it up to the heavens, MAKE A FREAKING PLAY. Expecting our offense to sustain 80-85 yd drives consistently is not realistic. Cause turnovers, shorten the field, and watch the offense improve.
People over focus on mistakes by Safeties. The biggest problem with the Safeties in terms of tackling has been that more players in front of them have been missing tackles. Most people don't notice when LBs, CBs and DL miss tackles because there is normally someone behind them to clean it up; however, once it gets to the Safeties, there is more open field and a missed tackled can result in a huge play. Church has missed some tackles but not really more than have been missed at other positions. Wilcox has been decent. As a single high Safety he will always be in some difficult positions in terms of being in position on pass coverage. Sometimes they have the deep Safety cheat to one side based on who is playing CB or the offensive tendencies. That eventually results in the deep Safety being out of position. The deep Safety is also very dependent (especially in this scheme) of the LBs and CBs playing within the scheme. The deep Safety is coached to expect those other players to react in specific ways and to base his angles on what those players are expected to do within the scheme. If those players in front of him deviate from the scheme, it will cause him to appear to be out of position and to have taken a terrible angle.
I think part of the reason that all of the defenders have had some struggles with tackling is because they changed the scheme a bit this year. They use a lot more man coverage now which puts players in different positions in terms of defending the run or tackling receivers after the catch. Also, they've tried to generate more pass rush in some games (Falcons, Saints) by using methods that can result in getting gashed by the run. They've been gashed by the run or pass to the RB when they've blitzed and they really got gashed due to having he DEs rushing wide. In the past they often had the DEs in more of a controlled rush avoiding the wide up-field rush; however, this season before Hardy came back they were not getting enough pressure or turnovers an tried to do things to generate those. In the 1st half of the Falcons game they had Lawrence rushing wide up-field which they didn't do much last year. They usually like to have that LDE rush in more of a straight line to the QB in order to maintain some amount of run contain without actually having to read and react.
I did a review the critical failed defensive plays in both the Falcons and Saints games and the Safeties didn't show up that often in terms of being at fault. I define critical fails as 3rd/4th down conversions allowed and plays over 12 yards as well as scoring plays that could reasonably have been prevented (i.e. I don't worry about a TD when it's 1st down at the 1 yard line and it's a run because the probability of the defense getting a TD in that situation is high).
Tacking by the CBs really needs to improve. People think that Claiborne has really improved, but he showed up on the critical fails in the Saints game way more than anyone else. Also I think one reason they have struggled with the pick plays so much is that in years past when they tried to mix up coverage to combat the pick play, Claiborne almost always made the wrong decision and he and Scandrick would end up covering the same player. Scandrick could then be seen yelling at Claiborne and trying to explain what he should have done. This year they're trying to keep it very simple for him with straight man coverage; however, that makes them susceptible to the pick plays because offenses know that they won't mix up the coverage.
The bottom line is that it would be nice to upgrade the Safety position possibly by moving Wilcox into the box and putting a guy like Jones deep, especially if Jones can catch the ball when an INT comes to him; however, in general the Safety play often looks worse than it really is just because that's the nature of that position and how is looks from the TV broadcast view.