If it doesn't fit their narrative it doesn't exist. Remember that.
Kate and Emma are the focal characters of this book an Their roles as Red Queen and White Queen it makes sense. But the spotlight hasn't ONLY been on Kate. We know that Bishop will have a sub plot as Kate's right hand, we know that Storm joined the Marauders in order to protect Kate from Emma which seems like it leads to a confrontation down the line, Iceman and Christian Frost have been hinted at having something bubbling under the surface. And Pyro is...well Pyro.