[@Oak7ree] The idea is that dragons are instruments of change. Whenever something happens that will affect the world in a big way, the dragons are there, helping it along, before returning to wherever they usually hang out. Maybe also, following with previous ideas, some are supporters of Chaos and some of Order? Similar to the Kingseeker Frampt/Darkstalker Kaathe conflict in Dark Souls, if you've ever played it (the idea is that these two ancient beings are trying to manipulate the player into choosing the ending that would support them).