I get the same sense about Landry, although I can see that having a safety who played at his 2012 level might be more valuable than a top flight corner. I would be wary about Landry though, if for nothing else than his injury history ( i.e., last year was the exception, not the rule) I'm surprised no one is suggesting trading Cro and going all in to sign Revis. Given the possibility of getting undervalue for Revis ( low one or two) why not trade Cro at top value ( getting most likely a two).
I don't see how we can bring back Landry. If we were in a better cap situation then I would say there's no way we can lose him, but since we are in a mess and need to upgrade the offense then we will likely need to move on.