Simply put it's suck. You cannot build native government while startegos or hellenic administration give no local recruit and building colony or polis does nothing except culture convert since they give no recruit.

But if you want to defeat Ptoelamic you need to conquer Ptoelamic Theron since it's one of the Ptoelamic starting region even if it's counterproductive to do so.

Is there any reason why non Ptoelamic get no benefit on holding Ptoelamic Theron considering it's part of Ptoelamic at start?