So I left a review on the chapter, and got a pretty long response from him about it.
Relevant things: He says he never said anywhere this will be a harem, instead he implies that the named girls will be going after him, not him collecting them. Doesn't actually say that though.
Ranma is apparently staying human the entire time.
Rias will be interacting mostly on her own with him, Ranma won't be playing around with her peerage, which I guess cuts out a lot of the dxd plot. He's going to ignore the fact that Rias is basically all about her peerage, and instead just focus on her not interacting with them to interact with Ranma.
He put Saeko in just to have another 'strong' human, because he likes her, and becuase hes going to put the hsotd zombie shit as a subplot later. How that can actually be a subplot I have no idea, because its hard to make a global zombie apocalypse as anything less then 'the most important thing going on right now'.
He plans on Gabriel falling, which kind of fucks the Angels over pretty hard.
He agreed that his 'i dont use weapons' stuff is dumb, but hes using it for later plot reasons somehow. Also he defends his use of the retarded nerima wrecking crew/chaos magnet comments because he wants other people to know about the Nerima martial artists, and feels that using those are the best way. And that the ideas themselves aren't rather dumb and annoying (and pretty far from how the public acts to the ranma characters when they are seen doing shit), but are enjoyable and good ideas.
He isn't sure what he's doing with Issei, either he's going to die to Raynare, he's going to join Ranma's new human faction, or he's going to be a buttmonkey for a bit then redeemed out of shittitude.
Lastly, the story will supposedly focus more on Ranma/Asia/Saeko/Rias as the driving forces of the early-mid of the story, with only token appearences by Ranma characters, with Sona and the two kuoh peerages being involved but not as importantly.
Basically, his plot seems pretty fucking weird to me (Random HSOTD thrown in, Gabriel the second strongest Angel falling, ignoring the existance of the hero faction/magicians and having Ranma form his own little group as the strong humans, etc). The comments he made about fanon are the most annoying part- I fucking hate the name Nerima Wrecking Crew, and its one of the bigger red flags I have for stories I'm gonna need to close out of.