Ravens coach John Harbaugh was talking to me just outside the Ravens' locker room one afternoon during 2014 training camp when safety Darian Stewart walked by. Harbaugh called Stewart over and introduced the free-agent acquisition as one of the best kept secrets in the NFL. After Stewart had walked away, Harbaugh predicted that the safety would have a really good year. It really never happened for Stewart who had a relatively uneventful one season with the Ravens, starting 14 games and registering 40 tackles, one interception, one forced fumble and one fumble recovery. Stewart didn't play poorly, but he certainly didn't stand out, so his free agent departure to the Denver Broncos following the season generated little more than a shrug from the team's fan base. Stewart, however, capped a solid first season with the Broncos with a standout showing in Super Bowl 50. He had a sack, a forced fumble, two passes defended and three tackles as the Broncos shut down the Carolina Panthers. Good for Stewart, who is a solid pro and was well liked by his teammates. But his performance this season certainly makes you wonder where that player was last year. Perhaps, the simple explanation is that Stewart benefitted greatly this year from playing behind two shutdown cornerbacks in Aqib Talib and Chris Harris Jr., and alongside extremely active safety T.J. Ward. However, it's a fair question to ponder, especially with the team's struggles in recent years with signing free agent safeties, as well as drafting and developing them.