Does this mean that the real reason Zeno was immortal was because he had become a vessel for the yellow dragon kami? I mean, immortality is on a totally different level from having OP eyesight or arm/leg strength. Perhaps without the dragon inside him, Zeno would have just had impeccable regenerative abilities and would only be able to die from a mortal wound or "old age"(at least as far as dragon warrior lifespans are concerned). 🤔
I'm also more willing to forgive the yellow dragon kami than the rest of the dragon kami. We have yet to hear his perspective after all. Perhaps he became sympathetic to Zeno and the other warriors only after Kaya died. Perhaps he had no power to change things for Zeno due to the promise mentioned in this chapter. Perhaps the dragon kami have very little say over the world at all. At the very least, he isn't trying to obstruct Yona and the dragon warriors for his own self interest the way the other dragon kami are.
Also, to put things in perspective, the dragons have been waiting for Hiryū for a little over 2,000 years. What is that in the face of their existence from the dawn until the end of time? In comparison to their natural "lifetimes", that might be similar to how long we've been waiting for a second season of the Akatsuki no Yona anime. XD