Turner, 68, has helped running backs and fullbacks be productive in Denver, Washington and Atlanta
Though many wide receivers have been cut loose, 49ers have retained Smelter from previous regime
Pierre Garcon addition helps group as a whole, but many others are untested or coming off injuries
Saleh keeps tracks of players who "loaf" during every practice, forcing the whole unit to constantly hustle.
Dumervil is coming off an injury-shortened season with the Baltimore Ravens
Defensive end/linebacker Aaron Lynch says new scheme allows players to play "fast as hell"
Robinson appears to be the gem of the three cornerbacks selected by San Francisco in 2016 draft.
Shanahan says he hopes players can be tested in new ways at multiple positions
Byrd has been a three-time Pro Bowl player, but has battled injuries in recent seasons
Niners GM John Lynch says Taumoepenu plays "with his hair on fire"