I like imagining Grace & Rocky being so totally & obviously in head-over-heels soulmates-type of love in the beetles footage & anyone who watches it just looks at it like

Grace explaining sheepishly to Eridian linguists that the reason he uses different pronouns for Rocky than for the rest of the population is that he reflexively defaulted to assigning Rocky the same grammatical and social gender that he himself uses, in a way that has historical precedent but in modern English is considered somewhat chauvinistic and backward, and he's not proud of it but also the habit is pretty deeply ingrained now and unless Rocky objects it's probably easier to just keep on as he has been...