The NFL has reached a weird kind of parity. There are 16 teams playing a 4-3 and 16 playing a 3-4 (if you count NE a 3-4 team & I do) Some teams are hybrids and I think we are headed to hybrid land. This means that Perry isn't the only guy that's on a team that it's style doesn't quite match scheme.
Perry isn't a 3-4 SOLB. He also isn't a 7 tech, hand in the dirt 4-3 DE. He's more of a sub package, spot guy. They need to put him in spots where he can use his bull and edge rush, that's what he's good at. Coverage or 3 down play just ain't his thing.