As it is, what realms are powerful and what realms aren't isn't firstly a factor of politics, it's a factor of geography. The way the continents were made, some spots are MADE to host superpowers, and others are INCAPABLE of holding them.
For Beluaterra, I'll agree with you that the deletion basically froze the situation in a bad place. It was mostly a good geography before but a wide swath was deleted right in the middle.
But, hey it could have been worse. It could have been that Ete was deleted but Eno remained. :-)
For the other continents, however, it doesn't follow from your analysis that there is anything unfair. Sure, the Giask-Askileon area is a natural spot for a super power - but why is that that it's Luria that lives there? Because the players in that area have created a culture that, in its current incarnation, calls for a united realm. In the past it's been pretty disunited, and when it was it was a hotspot of warfare that, from what I gathered, has been fun to play for those present and even those outside.
Sure, you'll always get a concentration of power in that area, but that's good. Do you want to play in the heartland of a large culture? Create a knight in Giask. Do you want to play in a place with more of a frontier feeling? Create a knight in Caelum.
Compare it to the realm world. Powers ebbed and flowed, but there were places that have always been centers of power through the ages without much change. Take the Northern France-Flanders-Netherlands area for example - it's always been a cluster of cities. In Charlemagne times it was the center of his empire - an unassailable core. In time it changed, it's been split between different powers and then reunited many times, but the cluster always remained. It's not the map that changes, it's the powers.
