I'd be interested in seeing Gladiator split based on shield equip. When you're just wielding a sword, you're a gladiator. When you have a shield equipped, sure, you're still a gladiator, but you're also a Sentinel.
It'd be interesting if you equip your job stone with just a sword, you become a Knight with a great sword. If you have a shield equipped, you become a Paladin.
If they ever give archer dagger access, if you equip your job stone with a dagger equipped, you become a Thief. If you have a bow equipped, you become a Bard.
Using your job stone with a two handed THM arm would turn you into a White Mage, but a one handed arm would turn you into a Blue Mage.
Same concept for CNJ. Two handed arm turns you into a Black Mage, one handed turns you into a Red Mage.