What threat is Gordon to Rosalind?

Gordon would like a woman with the ability to have babies. David awakes with Sophie dragging him through the woods. David gets in touch with Michael via thoughts and finds out Rosalind and Petra are safe. Sophie shares with David that she is in love with the spider-man, whose name is Gordon. However, she is sad because she knows he will leave her for a woman like Rosalind who can have babies, because Sophie was sterilized before she was taken to the Fringes. Sophie asks David if he is in love with Rosalind, and he admits that he is. David assures her that Rosalind will not agree to have children with the spider-man. David explains that he knows this because of his ability to communicate with Rosalind via thoughts; Sophie is skeptical and confused, but accepts the explanation.