>I'm rather curious as to why they have a city
>on Cybertron, other than conveniently sized buildings.

That's pretty much why. When the WDF and the Autobots were working out the details of their alliance, one of the considerations was what WDF units would be assigned to help garrison Cybertron. A Zentraedi Guards unit was an obvious choice because of the scale, though there was also, at the height of the pre-Exile WDF's presence on Cybertron, a Destroid unit posted to the vicinity of Iacon.

--G.
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