Then why are you arguing a safety is a linebacker??? Let me put it a different way. Most positions have responsibilities that overlap with other positions. On a running play every defender is a run defender for instance. Some are better than others. Chung is a good run playing safety. Harmon is not, for example. That doesn’t make Chung a lb it makes him a safety who is good in run support. That is not unique at all to the patriots. If you want to run a nickel base it makes your safety run defense more important to your success. It doesnt make your safety a lb. Our nickel base is not a case of removing a lb and putting Chung in his spot playing like a lb. that would serve no purpose. It’s removing a lb and adding a safety, creating more liability up front that a good run defending safety is very worthwhile having.