Still unanswered question: why did the Beast slaughter all of WolfRam&Hart? EvilCordy even finished the job.
Given what this BB seems to be (worshiped and beautiful), I’m thinking that it actually believes that it’s the GOOD GUY(or GAL). This reinforces my belief that the HigherPowers/PowersthatBe are the ones really behind this. It fits. They’ve always been unable to do all the “good things” they wanted to without using proxies. They’re sick of mostly just watching, shifting minor events and trying to get champions to do the right things. They want to get busy with the world and make it what they’ve wanted to be: they think they know best, and they’re sick of watching humanity screw up the potentially perfect world THEY could make.
This naked chick is a fulfillment of that wish: now they (or their avatar) can act upon the world directly. It’s everything they’ve ever wanted. No more dooting around sending humans to solve little problems and saving stupid lives.
Unfortunately, that means that this is the standard “bad guy is bad because she’ll do anything to “fix” the world: even if that means doing all sorts of evil along the way.” But it’s definately in line with the moral of Whedonverse: that even the good gods and authorities are ultimately corrupt, only humans with souls really have the right mix of humility, compassion, and ambition to do the truly “right” things.