By Daniel Chavkin The rookie out of Rutgers will supplant Clyde Edwards-Helaire in Kansas City’s starting lineup. The Chiefs are adding running back Isiah Pacheco into the starting lineup for Sunday’s game vs. the 49ers, NFL Network’s Ian Rapoport reports. It will be the rookie’s first start in the NFL. Kansas City had started third-year running back Clyde Edwards-Helaire in each of the first six games of the season. But Edwards-Helaire has carried the ball more than 10 times in just one game this year, with just 259 rushing yards on the season. However, his five combined rushing and receiving…