We know from Africanus and Eusebius that in dynasties 4-8 of ancient Egypt that there are at least 54 mortal kings missing from the list of kings that have come down to us. Potentially it could be as many as 150 missing mortal kings from this period. I can't be certain, of course, but I suspect the answer to your point may rest in those missing kings. To our present day eyes, it may seem that the king lists that have been preserved are a nice, neat unbroken line of Egyptian kings stretching far back into antiquity. But that is simply not the case--there are gaps; lots of them.
Edited 1 time(s). Last edit at 06-Jan-18 10:31 by Scott Creighton.