One random thing I didn't realize about Oweh that I just came upon is that the Chargers basically used him last year as a designated pass rusher, he only played about 40-50% or so of the snaps in most games behind Mack and Tulipolotu who were the clear starters.
70% of his snaps were passing downs and usually in clear passing situations (3rd and 5+, etc.).
Some people might argue that he's going to be even more productive in a full-time role, but given his play style and size I think it's more likely that he gets worn down if asked to play 70-75% of the snaps, which is presumably what you're expecting paying a guy 25/year.
I liked him a good bit as a FA option if we wanted to spend money but signing him to 25/year like the Skins did to play a full-time role is the type of FA move that backfires.