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What would be the effects of an earlier migration period, such as, before or during the crisis of the third century, have on the Roman and Sassanid (or Parthian, if early enough) empires at the time?

Would the various tribes be as successful in invading the Roman empire and what effects would come from this? Also should the huns managed to arrive a century or 2 earlier without triggering the Germanic tribes from moving south would they be as much of a threat?
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