That's a good point Lyth. Zoners are, commonly speaking, not even a loose federation like IMG - like the Bounty Hunters Guild from vanillia, who were flying only the common technology and ships, not being necessairy the big organization. IMG are, according to the original lore, not really a one single body at all.
Going back to rules, which I never wanted to mention, but let's go ahead with that. If Zoners aren't a single faction, they are, this way, a generic faction. Zoner ID is a generic ID then. Like Freelancer ID - but they are mainly dedicated to steady trade in regions far far away - and inside house space on a smaller scale. Also, I do not really understand "defending the Zoner bases/ships" line. This way, no Zoner ID is allowed to shoot at the vessels violating NFZ, just a small remark here. Because I do not see such a line.
This however means that TAZ has no right to ask for FR5, because Zoners, like Freelancers, aren't even a single faction and TAZ do not equal Zoners, because Zoners aren't even a political power. This however would be resolved in one way: Pueblo Bonita have TAZ IFF and one station of choice around as well.