Lung has taken Masaru under his wing, as he did with Ryumyo long ago, remember ... Masaru is the New Apprentice, not as talented as the old one, but far more moldable. Masaru's also the one who woke up as a lesser dragon, then upgraded himself in the 6th world and is, thus, the newest Great Dragon.
Ryumyo was working on upgrading himself into something greater than a Great Dragon, but the Comet blew that up in his face. Who knows how far it set him back?
Aden remains a wild card, but one who was present at the DC Rift when it blew up, so probably has some sort of understanding with Ghostwalker.
Lofwyr, obvious.
Ditto the Orange Queen.
Arleesh is doing her thing.
...
There're a lot of dragons. (For some reason, I want to say that, back in first edition, there was a not ethat there were only twelve Great Dragons, as if the number has a mystic importance and that's all that there COULD be ... one had to die for a new one to rise up. But I have no idea *why* I think this.)