By Jennifer Piacenti Kenneth Walker III is a slight favorite at SI Sportsbook for Offensive Rookie of the Year, ahead of Dameon Pierce. It’s time to check in on the futures market at SI Sportsbook for the NFL’s Offensive Rookie of the Year award. Though there has been a ton of talent on display from this season’s rookie class, it looks like a pretty clear three-horse race at the midway point of the season. Two running backs are at the top of the list, while a wideout has the third-best odds. Here is the complete list of odds at SI Sportsbook. 2023 NFL Offensive Rookie of the Year OddsKenneth W…