Reading Gerbasi's paper, it sounds like part of the thrust of her research was "some of the stuff furries say about their furry identity sounds like what transpeople say about their gender, I would like to have some real data on this to consider that". Which… doesn't bug me, to be honest. I look at my own feelings of gender stuff over the course of my transition, and I look at what Otherkin say about themselves, and I see something in common; I'm lucky in that my identity/body differences are simpler to reconcile. I think it is appropriate to begin to ask questions about Otherkin using the methods that have been developed to classify gender issues.