I'm not gonna lie. I've read everything but the fifth section. Your post is very long, so I've decided to skip the more subjective part of your text. The facts that you've presented to us interest me more than the more subjective part, which section 5 introduces.
I am still not very sure that comparing this game to DPC's previous one, even if they have more or less obvious similarities, is worth it. I mean... This game is so, so huge... Ep. 9 alone has a larger render count than AL as a whole.
Anyway, to me it does not matter the whole concept of übermain girl vs the rest much. At the end of the day, every one of us has his/her favorite girl(s) for whatever reason(s), and that's it.
But from your post I can tell how much you love the game, how much you admire DPC's creation and how much you've worked to bring us this huge post. For that, you have my sincere respect.
One final (minor) correction (I hope you don't mind it). It is about
Acting Lessons. Even if you go for Rena, Liam can survive. And here it's the proof: