By Wilton Jackson The Gamecocks’ quarterback was happy about Jackson’s decision to commit to South Carolina. Spencer Rattler knows a thing or two about changing his mind and making the best the decision for him and his future. Rattler, who spent three years at Oklahoma before losing his job as the team’s starting quarterback to Caleb Williams, transferred to South Carolina in December. When South Carolina native GG Jackson announced that he was reclassifying to the class of 2022 and committing to South Carolina on Saturday, Rattler tweeted about his discussion with Jackson prior to his decisio…