Walker liked to think that he had the pride of dragons well figured out. He had seen the stories and compared it with what he had learned. Compared to what he knew, Light dragons were the only ones that held to the older beliefs that dragons were all powerful. Their pride was greater than the other dragons.
Even Terron and Ignus, who were the most stubborn of the royal dragons, had the ability to accept others. This proved that the dials the dragons had followed for so long were not what they believed wholly anymore.
Believing in only pride and one race being all powerful was hard to do. The dragons had seen the other races achieving other things they could not. Researching other things that they lacked. Runes being one of them.