There isn’t a single guy in the draft that has proven a thing in the NFL. Dee Ford posted double digit sack totals in 2 of his last 3 seasons (He was injured and only played in 6 games the other year).
I would rather pony up big money for Moseley/safety combo and get your edge rushers in the draft along with a couple of mid tier signings. Moseley is about the safest signing you can get and immediately improves the defense. Clay would be more than fine if he had a supporting cast of Moseley inside and a high pick on the other side.
The Silverstein argument of keeping Perry is growing on me too. If you aren't relying on Matthews and Perry for everything, you could actually get some meaningful downs out of the guy. Perry is an ass kicker against the run and can get home. Perry even mentioned something about not being approached about a contract renegotiation. Offer Matthews a mid-tier contract and see if Perry renegotiates. That takes care of a lot of depth issues as well as having a good rotation.