A potential light heavyweight barnburner is on the UFC’s fall slate. Paul Craig (15-4-1 MMA, 7-4-1 UFC) is set to take on former title challenger Alexander Gustafsson (18-7 MMA, 10-7 UFC) at a UFC event set for Sept. 4. MMA Junkie confirmed the booking with a person close to the matchup following an initial report from Front Kick.The person requested anonymity because the UFC has not yet …