I'd have to agree with you, Daeres. I think the near eastern nation are 'way cool', but by the time of Alexander they've passed the point where they could rise again as powerhouses. Egypt's past her time too. We'd need a new, dynamic state that could come and swallow up most of the Persian empire. Arabia is out of the picture as the sort of dynamic expansion outwards was only allowed because of the 6th century population boom. Hmm.
Perhaps a dog-pile of nomads is needed. The Dahae flood into Hyrcania and Media, the Saka through Afghanistan, the Scythians through the Caucasus. The issue is that it's doubtful they would go farther than the Iranian plateau; such a push is beyond the momentum of any tribe at this time.
The epic logistics for such a thing are probably beyond the resources of an Egyptian state barring some insane revival that probably bends general logic.
Perhaps a dog-pile of nomads is needed. The Dahae flood into Hyrcania and Media, the Saka through Afghanistan, the Scythians through the Caucasus. The issue is that it's doubtful they would go farther than the Iranian plateau; such a push is beyond the momentum of any tribe at this time.
Your scenario of a rebel conquering Persia could pretty easily be accomplished. It would be interesting to see an Egyptian carving out part of the Empire for himself or something akin to it.
The epic logistics for such a thing are probably beyond the resources of an Egyptian state barring some insane revival that probably bends general logic.