Besides, Maxos made those Dragon Knights... He obviously had to give them dragon knowledge! Without having that kind of knowledge, he wouldn't be able to do so, would he? It means he had that kind of knowledge, so he WAS a DK!
If you read and listen to every piece of story the in-game, as I remember it, the game tells you Maxos was a human who's quest for knowledge became so great the Dragons gave him the power to create dragon knights. He eventually became intellectual equals with the Dragons; and thus presumably left his tower for other intellectual pursuits. IMHO I think he transcended the realm that your character plays in and thus no longer meddles in the affairs of humans and dragon knights alike.
