My opinion on Verse, starting in his second season, was that he was not athletic enough to ever get big sack numbers. He is a bit muscle bound and not a fluid enough athlete (Hence the bull-rush being his only real move). Verse was seemingly always just missing, and so frustratingly close to getting sacks. It always seemed like those little elusive moves that QBs make when they feel the pressure were just enough to get away from Jared. He is a good edge. He gets pressures and hurries, and sets the edge well enough, I just don't think he is ever going to develop into one of the big sack number guys.
Edge/DE guys that get 12+ sacks are almost always fluid athletes.