Maybe this is preseason optimism, but I am not too worried about the secondary. I worry about RG and WR. Here is why I think the dbs are going to be fine:
Godfrey is better at FS and he will become more of a QB back there-a veteran leader who can align folks. That is what Rivera was saying.
Mitchell reminds me of Chris Harris, and we got a gem in Lester. If neither is better than Campbell, we know what he can do and he should improve. I would not be too surprised to see a rotation at SS, depending on the Offensive personnel and the down and distance.
At CB, we should be excited about the experience our youth got last year. I was worried about Norman's confidence, but it seems fine and he is doing well. Thomas showed that he can be a solid CB, and we are more than set at nickel, probably the hardest DB position to play well.
Many of our DBs are ball hawks, and they prosper when the QB has pressure to throw. They can jump routes, etc. We have all of the makings of a defense that will force the offense into mistakes. While these DBs are not going to shut down anyone, they should be opportunists, taking advantage of a front seven that will limit the run game and give the QB less time to throw.