None of that group look like they're basketball fans willing to purchase tickets to a game.
The black guy in the white T-shirt does. He was probably the groomer, the "cool black guy" who told the girl where to meet him.
Don't kid yourself. The country is full of 15-year old girls saying, "I can't wait to turn 18 so I can start an OnlyFans!" They're also being told that sex work is glamorous and they can make a lot of money. They believe this.
I read elsewhere that it was one guy with a counterfeit ticket.
Accomplices were probably nearby in a car.
Who knows what the girl could have been told, that her dad had a heart attack, etc.