It seems like we've been playing some form of it, which can explain for the safeties being deep and close to the sidelines when the opposition continues to throw slants and crosses, successfully, over the middle. But...every coach has their wrinkles within a system/philosophy. Just like other coaches have employed the West Coast with MUCH LESS success than Bill Walsh and Mike Holmgren, the same for defensive philosophies. Hell, look at how Montie Kiffen's system (the inventor of the "Tampa 2") has faired in Dallas.