Marc Raimondi, ESPN Staff WriterMar 6, 2024, 10:42 AM ETA LARGE MOTOR COACH bus pulled out from the side of TD Garden in Boston, and with it came a swarm of people. The oversized vehicle turned onto Causeway Street as security attempted to disperse the mob.It was Aug. 18, 2023, right after the finish of the UFC 292 ceremonial weigh-ins. Several fighters competing on the card were riding the bus back to the host hotel. The assembled fans, many of them teens or college-aged, were there to see just one: Sean O’Malley. Some wore wigs matching O’Malley’s curly, Fruity Pebbles-colored hairdo.A…