Pretty sure everyone is called a traitor if they dont follow orders.
But yh your right people will be aiming for your spot. But then again theirs aleady a lot of open spaces since its never filled.
I mean, as far as we know, your regular assassins don't get orders from the JAA unless they're in direct employ. Heisuke was just bumming around and Boiled dropped the Sakamoto job like it's no big deal. I think unless you're actually order, you don't really gotta worry about JAA stuff beyond the whole paying fees deal.
Also we don't know if Assassins' beyond those aware of the Order's workings are even sure about the 10 seats. People, who aren't sufficiently high in ranking like Boiled, don't even know who's order or not or if they even exist and the way Nagumo spoke about it, they don't even know the roster/if it's full.