OK just read the new chapter and had to share some thoughts.
1) the resemblance to the beginning of this journey. They looked for jae-ha last and he has been the first to disappear. Shin-ah was second and we are back with just kija. The dragons are being lost in reverse to how they were found. Aside from Zeno of course who, just as he showed up the first time makes his presence known only of his own accord.
2) Zeno being pressed for questions and obviously either lying or avoiding saying anything. Particularly with his quick response to the chalice.
The chalice was the start of this mess for Zeno. It gave him immortality and with it centuries of agony. What if he suspects that there's a way to use the chalice once more to reverse it? What if it holds the secret that will let him finally die? The palace has been burnt to the ground, the sanctity of the mausoleum breached and the chalice stolen. We don't know what chagol did with it while it was in his possession. Maybe the circumstances combined and with everything on a knife's edge with the dragons and their holy artifacts/places, it all leads up for Zeno to have an out. To finally die. He loves the other dragons as he did his own dragon Brothers but he knows either way they will die and leave him like every generation before. If there is a chance that he can finally join them and all the others before. To join hiryuu in the heavens. I think he would be hard pressed to pass up that opportunity if it ever arose. It's the only thing I can imagine that would tempt him to in any way betray his friends. We know he hides history and info on the dragons many times in the series but this and the behavior surrounding it is all just so different.
This was total conspiracy theory right here but lemme know what you think.
Honestly in my ideal scenario with the dragons this whole issue with their powers leads to a form of death wherein they lose their powers and become human. Maybe that means the eyes of the dragon go blind. Maybe the green and white dragons become amputees. In some physical or metaphysical death they separate their lives from the dragons powers and that let's them stay with their loved ones.
I don't know but God damnit I can hope.