Javin's folding down the left armrest in that first panel, but Gilou's in the way so you can't see it.
Such as the way Nephos tacked 'Thalassa' to the front of his name. Neither Partasah nor Gilou has 'Caliga' on the end of theirs, however. Most people assume it's just because they're Aquaans and don't want to take a human name. It's more complicated than that, and Nephos' proper formal address is 'Mr Thalassa' not 'Mr Caliga'. Start from the beginning of this arc. Start from the beginning.