SIOUX FALLS — Eight years ago former South Dakota State and NFL running back Zach Zenner hosted a kids football clinic at the Sanford Fieldhouse in association with Sanford Power and the Riggs Academy. One of the young athletes there to meet Zenner and learn from a pro was a young Griffin Wilde, who nobody knew at the time would soon become one of the best athletes in South Dakota. "I got his autograph and got a picture with him," Wilde remember…