The amount of level 10’s they are hoarding is kind of suspicious, don’t you think? If Plague were doing just a normal conquest push, they wouldn’t need all of those leveled dragons. HOWEVER, if Plague were attempting to steal Nature’s holiday, then I can see why they would need them.
I assume most of the dragons on the first page are their permanent dragons, but the pages after that are clogged with leveled dragons. I wouldn’t be surprised if there were more lairs like that. Watch out for more suspicious stuff like this, Nature.
It’s a common courtesy that the flights get their holiday. I doubt plague will do that on the last week of May.