The opponent is the opponent but No. 6 Ole Miss flexed its muscles early and often and let the starting offense enjoy the final 30 minutes of Saturday’s season opener on the sideline. Furman’s defense was not a match for the Rebels potent attack led by quarterback Jaxson Dart, who put up video game numbers and played only two quarters so far. Despite lobbying to take the field after halftime Dart was left watching backups Austin Simmons and Walker Howard. In those two quarters, though, Dart was looking like a quarterback determined to send a message about Ole Miss and its offense. His five pas…