The Los Angeles Chargers made a handful of big moves this offseason that earned headlines and should change the franchise for the better.  Tops on that list, of course, was merely going from Greg Roman to Mike McDaniel at offensive coordinator, which is a big departure for Jim Harbaugh.  That was the big domino that let all the others fall. From there, the Chargers overhauled the offense to McDaniel’s vision. There wasn’t some big trade for an AJ Brown or a George Pickens, but there were a smattering of smaller signings, like fullback Alec Ingold and tight end Charlie Kolar.  One other McDaniel signing, by the way, is one of the best overlooked moves for the Chargers, if not any team outright.  NFL free agency’s most underrated move might belong to Chargers Keaton Mitchell | Tommy Gilligan-Imagn Images The speed in which the Chargers called the player in question once free agency started sort of says it all.  According to new Chargers running back Keaton Mitchell, McDaniel and other…