Why 49ers’ addition of Sam Darnold is no small-time deal

The biggest news for the 49ers on the opening day of the free agency negotiating period was agreeing to terms with defensive tackle Javon Hargrave, another high-profile, top-dollar star to go along with Trent Williams, Chrisitan McCaffrey, George Kittle, Deebo Samuel, Fred Warner, Arik Armstead and Charvarius Ward. The 49ers aren’t afraid of big names and big contracts. But as OTAs give way to training camp, the preseason, the regular season and beyond, the most significant Day 1 acquisition could be the insurance policy coach Kyle Shanahan and general manager...