If Austan is still willing to be 'kidnapped' as an egg, I have a suggestion for combining everything.

A close friend of the late Strongfire and Sharpclaw has always felt connected to Akuji's egg. When the egg disappears, that friend goes mad and then (or years later) reveals the existance of the remaining eggs to the evil dragon. After Blueberry or someone reveals Akuji's past existance, and the Tribe of Elderberries learn that the evil dragon is after the Three, the three need somewhere to hide and that leads to the suggestion of the human world. However, there is a tribe (human) that wants more of Akuji and are hunting for other dragons. Bounty hunters, they're called and the Three have to avoid them, leading their search for Akuji.

Yesh!

As for the start, I'll have to delete some of the Tribes. Not enough interest and the human tribes would require too many humans. The Shark Tribe's staying, and if Akuji lives with them, we only need one other. If Akuji is with another tribe, those two and the Bounty Hunter Tribe.

My dragon could go mad. Just saying.