The composition of the Patriots’ roster is perhaps the most unique we’ve seen in Bill Belichick’s 14 years as coach. The club returned 18 of 22 primary starters this season, so there is what many would consider the ideal layer of continuity. But as of opening kickoff, the Patriots also had more first- and second-year players (21) than all but two teams in the NFL (the St. Louis Rams and Cleveland Browns). Makes for a different type of mix – a contending team that from an overall perspective trends younger. The question remains: Is it the right mix?