To answer your question, I remember reading that the opposite gender will have a supporting role like Lucas/Dawn had. ...so I think there's a high possibility for it. I would like to find out more about Silver. In FrLg, they mentioned in the fame checker that Giovanni has a red-headed son. That may be Silver. Silver really doesn't like Team Rocket and he calls them all "weak." Maybe, he's into strong Pokemon, because his father (Giovanni?) probably always called him weak. He tried to get his Pokemon stronger to win his father's approval. His father probably wasn't around much throughout Silver's childhood and always spent time on his plans with Team Rocket. I'm just theorizing the situation. It would be interesting if that was true about Silver. I'm probably 100% wrong.