Jones suffered a neck injury last year and missed spring practices. It's possible that Jones and the Trojans coaches disagree on how severe the injury is, the Orange County Register reported.
Kessler is the Trojans second commitment from a quarterback. They previously received a commitment from Max Wittek of Mater Dei (Corona Del Mar, Calif.).
Neither is listed on the ESPNU 150.
Alabama, Nebraska and just about every Pac-10 school offered Kessler a scholarship. Wittek picked the Trojans over offers from Florida, Florida State, Georgia, Notre Dame, Nebraska, Clemson, North Carolina as well as just about every Pac-10 school.