The reason why Blue Star explorers are set as Lords at the beginning of the "Era of Civilization" is because of their unparalleled flexibility. These high-tier troops are ineffective in the hands of the decaying local forces, but once recruited by explorers, they can play various constructive roles, maximizing their value.
"But there must be a precondition for all this, at least you have to win. Battles are perilous, and outcomes are uncertain. Why don't you train soldiers yourselves and break through ranks?"