If any other threesom with the Queen ever happens (which I think it will), Shani and Zahra seem like the best positioned candidates for the "job". Shani has already had a sexual experience with the Queen and that definitely left an impression on her, the way Zaton and Shani seemed entranced by eachother. It could be the Queen herself to ask for a repeat, this time with a more active role. As for Zahra, I could see it happening but with Zahra being in a dominant role and making the Queen "pay" for the disrespect she showed when she visited them. I´m just trying to imagine how that situation could be caused. Maybe Zahra, with Zaton´s knowledge, asks the Queen to visit them again and then, very much like Shani in the bathhouse, she seduces the Queen into the threesome. And if we are at Zaton´s home, maybe even Shani could be there and instead of a threesome, we have a 4some! And not forgetting the other member of the house that already knows the Queen: Emilia.
Is he just against the Mutants, or is it any kind of outsiders? Does he hate the raiders too?
That said, that image could mean that Zaton and the Queen are trying to begin pushing in a direction that the Elders and the most conservative members, like this guard, are totally against, and that will start to cause conflict. The Elders think they control the Queen, and so far they kind of did, they did let her have her powertrips as long as she did more or less what they wanted, but if she starts aligning herself with other people and having different ideas, they might decide to get rid of her, which in turn would make us have to get rid of him and others like him. I suspect he isn´t the only one who thinks like that about non-Zetans.