Why the different colored jersey?

I was sitting next to someone the other day who asked me this FAQ. I am a casual fan-friendly sort of guy, so I gave her my usual spiel about the designated backrow defensive specialist, compared the position to a designated hitter, told her to watch the "substitution" pattern as one middle hitter came in and another came off, etc. etc. etc.

But it dawned on me that I had missed a real opportunity to mess with someone's mind, an occasion one should not cruise past blithely.

I have come up with three, better, answers. For future use. Let me know which one you prefer.

1) "Oh, her. She's a real head case. Coach is at her wit's end, but the kid just refuses to wear any other color."

2) "What are you talking about? They all have the same colored jerseys on." Continue with this no matter how insistent the spectator becomes.

3) "She's on the other team. She gets to play on the other side of the court and try to screw them up. Just watch. She's really, really good at it."