Maybe the Skins are just relying on Chris Wilson to be a good enough pass rush specialist to produce. I don't know. I hope they're seeing an adequate number of late-round steals, and they're going for value. I'm just annoyed because I don't really see what differentiates Davis from Cooley. Maybe they're looking for an heir apparent to Cooley, but I'd hope that they'd use Cooley as tradebait if that's what they're doing. Don't take notes from the Nationals and get nothing for your veterans.
The West Coast offense works better if you have two athletic TE's. There's no default setup for it, but there usually is only one RB in the backfield. Davis can run and Cooley is a great short route TE, so I see it as a great idea to have both.
I think you're right, we should be looking for the defensive players in the later rounds.