DE failures: will Granderson and Baun teach FO a lesson?

Why are we already declaring Foskey as a bust? He hasn't even finished his rookie season. By those standards, Cam Jordan would have been a bust. It's really, really hard to find good edge rushers, hence why they're some of the highest paid players in the league. I would imagine if you looked at the hit rate of most of the league on edge rushers in the 1st round it would be quite low. They're not a dime a dozen like RBs and linebackers.
Foskey has produced one noteworthy play. He was not committed to getting better in training camp. And he has zero bend.