I'd take a wait and see approach for now. That is, unless there is a promising prospect sitting on another team's bench that can be had for little to nothing.
I seriously doubt that guy exists, but if he does, I think Fitterer will try and get him.
Something to keep in mind, Panthers new and improved line is the key to the defense this year.
While it is always nice to have a lock down DB like Horn, is it as critical as it once was? With our improved D line? Perhaps, an adequate DB, one that can cover just long enough to give our guys up front time to get to the QB may be all we need?
Maybe the answer to all these questions is already on the roster?