The three players have started 295 games combined in their careers, but they appear to be nearing the end of the line.
Smith is no longer the pass rusher he once was, and he reportedly wasn't a great fit as a 3-4 defensive end in practice. Kelly, 34, was coming off a torn ACL. The Patriots are very thin at defensive tackle, but clearly they didn't believe Kelly was going to help them. Anderson was competing at a deep position and wasn't helping on special teams, according to ESPN's Mike Reiss.
This is a Patriots defense that looks better on paper than it has since 2007. It definitely got younger on Monday.