I've never played corner, but I imagine that if you have really good safeties, you get better play out of your corners as well, since they're able to play the position a little more honestly and they know that there is backup. They can take bigger risks and get bigger rewards because of it.
Sean Smith has actually had a couple of plays the past few weeks where he let his receiver get a first down underneath (with him several yards deeper), despite having a safety over the top. Normally, that allows the corner to break on the route and try for the interception, but it just seems like the DBs don't mesh very well. Hopefully, this is a "first year with new coaches" thing, but the guys have played together for a good while now.
Author