I think Caprica and Baltar taking Hera into the CIC was
pivotal, and it really couldn't
have been anyone else, because of their dual roles, the fact that they were respective leaders from the two sides who came together out of love, the fact that together they led to the destruction of first most of human civilization, and then, most of Cylon civilization (even though Caprica was separated from Baltar at that point, I really think her exposure to him played and other humans played a big part in that).
And foremost amongst this, in my estimation, is that they were real-world proxies for the angels, who, for whatever reason(s), took their form for eternity and somehow made certain that the two of them existed in exactly their form "in the flesh" at this point in time, for the purpose of "rebooting" humanity properly... At least that's how I see it. While Baltar and Caprica were never more than Human and Cylon, they were, somehow, "divinely inspired."
I commend an "atheist" like the wise Moobius for nonetheless giving this series finale props for the way it went out. I'm not a religious person, although I believe in "God" and an interconnecting, eternal life force. Considering that most, if not all of the most respected cosmologists today also
seem to believe (or at least strongly support) hypotheses and theories supporting potentially infinite universes (multiverse theories), I'm also of the opinion that it may actually not be possible to even imagine something that doesn't already exist... Consider this viewpoint: The word "imagine" can be broken down into two other words -- image -- in, as in bringing into your mind's eye an image of something that already exists somewhere, sometime. Even if you do
something "new," who's to say you haven't actually created a "new universe" in the process... not just a "universe on film," but possibly a real universe
at some level, in some respect, which, of course, we can't interact with in any real way.
I'm well aware nothing I'm saying here is new. I'm not saying any of it's true, either... just "food for thought." Then again, prove it's not true.