actually arjos what you mean is that except for gallatians thraikians makedonians and hellenics weren´t all that diferent so they just took over the nobility role so by natives in 50 years time you mean the sons of the original kleurocheians wich where undistinguished from native egyptians except for their social standing wich also included priests and the old persian/pharaonic burocracy/administration

a bit like the seulekids started to be known as sirians and since they didn´t had that many distinguished caractheristics unlike gallatians with their 6 feet tall blonde hair and blue eyes and therefore where diferent for the outside observer

ofc thats just me making assumptions