Exactly, plus Ala Mhigo has long been considered by Garlemald as simply a source of cannon fodder soldiers/slave labour and not a place to settle pure-blood Imperial citizens. So the few pure-blood Garleans in Ala Mhigo would be officers like Centurions and Tribunes under the commanding Legatus (originally Gaius and now Zenos), who have been stationed there, given the fact in the past the Empire actually turned the citystate into a massive fortress.