I find that hard to believe, DBDC are very capable and have a vast connection of allied nations in the top 50 and 100.
DBDC trashed NpO and WTF, you definitely won't see anyone looking to oppose them if they do something naughty. Ok there is other alliances growing strong top tiers but to oppose DBDC is to throw your top tier down the drain.
But hey I wasn't paying attention to this game for the last years, maybe everything has changed and the top 250 isn't completely one sided. I doubt it however, when push comes to shove I think it is still the case.