Arche Seleukeia and the Ptolemaic Kingdom are both examples of Super Powers as well (although their sphere of influence was confined to a smaller area of the globe). Furthermore Achaemenid Persia was also a Super Power of the East.
Your example of Lusotanna is ridiculous (other than that they do have a tendency to go on the rampage in EBI). The Lusotannan were a people who were pastoral with very little in the way of large centralised government (and by very little I mean none). They never developed the bureacratic complexity to administer conquered lands for any length of time, and had no need to do so - they were successful enough as they were. That would be like me saying that because the Pacific Islanders havent developed into a Super Power, we should dismiss the case of the United States and Soviet Russia.
Of course Super Powers are the exception not the rule in any given time, but thats because a world stage cannot accompany more than 2 or 3 by definition (if the world was replete with super powers, they wouldn't be super powers).
I don't think you've made your point at all, and the collapse of nations and tribes to one faction was common throughout all eras until only 2 or 3 are left standing. Its an arms race, the size of the powers dictated by what is politically and socially feasible at the time.
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