The arcaneum was my idea. I worked from Abi´s post that spells are standardized, that´s all. His was a whole different point of the story, he spoke about the standardization system ad I assume he didn´t care about the organization behind it.
And yes Eyros army of 75% hobgblins would probably contradict a lot as there are posts about military duty and the number of major races. But if you want to, go ahead. Could be mostly mercenaries as mor and more people are shirking their duties.