I'd say it's exactly how kids who don't have jerseys attend games to feel part of it. I see kids in student section wearing, eye black, body paint, face paint etc. at just about every one of the hundreds of games I've coached in and attended. I guarantee you that the 10 or 11 you attended this year there were kids there wearing it. You just weren't looking for it.
Like the picture below. There's a bunch of kids wearing it but unl;ess you were looking for it, you would have never noticed.
The use of paint, eyeblack, or glitter was not what caused you to quote my post, it seemingly was that I said the kid was a follower for getting to the game and then applying eyeblack. Now that you have displayed your vast knowledge of the eyeblack situation, I can see this kid is likely a leader of his group and guides the group and probably ran out of his eyeblack and borrowed some upon arrival.