Well, for the Hive, gender is probably really different than it is for humans. Comparing gender roles is really difficult when you consider both Savathun and Xivu Arath's different aspirations initially when coming to the Deep. Savathun was hoping to be a brood mother and Xivu wanted desperately to become a knight. Xivu easily placed into her role as a Knight, something that people would probably consider to be a role for males in our society, but the Book of Sorrows doesn't even break a sweat describing her desires. My point in saying all of this is that the Hive are divergent from humans in dozens of aspects. It's not far off to say that they probably have a completely different view on sex and gender than humans do. Saying that Oryx or Aurash were trans is kind of reductive to the alien nature of the Hive. I think that the Hive probably don't see what we consider to be gender roles as gender roles at all, but as jobs. Their bodies probably shift to reflect the needs of their environment, which is why I would disagree with you saying Oryx is a post-op trans man. I can see where you're coming from in that assumption, but I do think that the Hive are just too different from humans to compare like that.

its not an assumption. Oryx, FATHER of Crota, the Taken KING, WAS born Aurash, Daughter of the Orsmium King, SISTER to Sathona and Xi-Ro. sexual organs are sexual organs in any species, and by the distinction of "male" and "female" being made, we can make the FAIR assumption that mechanically they are the same as we humans know them. now after that if females in Hive society act in a way that we would describe as "masculine" and so-fourth, vice-versa, etc, THEN thats something else entirely, could be like you said. but so far, functionally, female is the one that pops out the youngin' while males contribute genetic material, and Oryx is known as the FATHER of Crota. ergo, Oryx is a post-op transsexual (but in this case, the nature of that "operation" is unknown, but obviously different to the crude re-sculpting of flesh that we humans practice, as Oryx was able to produce offspring, therefore indicating fully functional sexual organs. unless of course, theres something that wasnt mentioned.)

We still don't know exactly how Hive reproduction works, and just because we've translated pronouns into our own language to fit doesn't mean that there's not meaning lost in translation. I still think referring to Oryx as post-op just doesn't really fit. I can understand why you'd categorize it like that but it just doesn't really jive with being trans. Also, being dysphoric is something pretty important to being trans and seeing as Oryx wrote the damn Book of Sorrows there'd probably be something in there about it if that were the case. Really boils down to semantics because I'm petty.