Okay, this is bothering me, and while I probably will betray some massive ignorance or wrongheaded assumptions in asking, I have to ask or it's going to eat at me.
Considering that it's not arduously difficult for a Lunar to get into Heaven and that they decided they were no longer going to play by anyone else's rules a long time ago, that is not a feud that lots of Celestial gods are itching to insert themselves into.
The Lunars have zero interest in maintaining the status quo and if they had access to a bunch of nukes, they would be trying to smuggle them into the Imperial City and set them off.
And my own point a few posts ago about how it's not that hard to know exactly where to find the Sidereals in Heaven...
I mean, am I wrong in thinking that the logical conclusion of these facts is that Yu-Shan should have seen a scourge of millions of beastmen laying siege to the Lotus Dome a few years after the Usurpation? I mean, yeah, the gods/Celestial Lions/etc probably would have resisted, but give Lunars a few years to breed a craptop of disposable beastmooks and zerg rush a-go-go.
I'll freely admit that it's been years since I've read the beastman rules and I don't think I even own the books they're in any longer, so I'm probably very off base here, but this is bugging me.