Like Bob said, there is a play to beat every coverage.
What the DC might say is that they expected someone to get pressure on the passer sooner so he didn't have time to throw downfield. A good pass rush makes the secondary better, isn't that we always say?
Another thing, I have heard a lot of people say how slow Church and Carr are and that Walker shouldn't have been able to score. Basically, Walker doesn't pull away from Church, he stays about the same distance ahead and is just running at an angle....there really isn't much yardage gained and Church had to change directions after the Claiborne collision. Carr shows some pretty decent closing speed but Walker is running toward him trying to stay away from Church. If Walker runs a 4.5, then Church and Carr are pretty darn close to that.