I have nothing against Church except his lack of speed. There are too many players on this defense that play at the low end of the speed requirements for their positions. On the defensive side of the ball , I want very fast players with no exceptions. I think speed has held this defense back long enough. For example, the Mo pick. If a team is going to draft a CB with the 6th pick in the draft, at the very least he should have above average speed. Mo didn't. I expect fast DBs and fast LBs. I will admit that my thinking was influenced by the defense's that Jimmy fielded during the 90's, but that doesn't change the fact that speed matters. Church is just too slow IMO.
I agree that Claiborne is not super fast to be the #6 overall pick. He ran a 4.43 which is not terrible, but with the 6th pick it would be preferable to get 4.38 guys like Patrick Peterson and Revis.
The Cowboys are more focused on finding "football players" over freak athletes. Bruce Carter was super fast, but didn't play up to that speed. Guys like Lee, McClain and Hitchens play faster than their timed speed.
Wilcox had an average forty but his 10 and agility times were better than average. He is heavier than most of the Safeties that ran faster.
If speed was an issue for him, which I don't think it is, he could drop a couple of pounds and probably improve it. Church dropped weight a few years ago from his draft weight of 222 to about 212 and was visibly faster. I'm not sure what weight is he actually playing at now. The DC.com website roster is never accurate. Players often mention their weight in interviews and it never matches the DC.com listing.
Scandrick ran a 4.32.
Carr ran a 4.43 but does not look that fast.
Byron Jones ran a 4.43 and looks that fast in game footage.
The DL looks fast/quick now and probably quicker than average.
Corey White ran a 4.39 at his Pro Day. He is probably replacing Sterling Moore who ran a 4.54.
Summary: Church, Carr and some guys that played the 3rd CB spot are the areas where speed could be improved. Adding Byron Jones to the mix improves the speed in the secondary. My guess is that Church remains a starter and will be the only player on defense really has below average speed.