The following is a lot of interpretation on my part with little actual evidence to back it up, so please take it with a grain of salt.
Regarding Hayashi, one of the most interesting things in the interviews wasn't was he talked about but rather what he didn't talk about, namely the romance aspect of the show. On what were six or seven pages of interview material, he mentions "love" exactly once, only to state that while it was important, it wasn't really his primary focus for this series. I don't want to infer too much from it, but let's that say that if he was actually the guy who wrote the majority of the romance aspects in the series, he sure managed to make it seem like he didn't really give a fuck about it.
This is something I've noticed with the other interviews as well. It's kind of strange really. There is a lot of talk about the setting and what inspired the series and what not, I almost get the impression that the writers were going for something entirely different and it happened to turn into one of the greatest love stories ever told by pure accident. Nishigori at least mentioned that one of his original ideas for the series was his guilty pleasure of a student getting seduced by a delinquent girl, so maybe it was actually him who pushed that aspect the most? Especially since he said he planned out episodes 1-15 specificially and he talks really, really fondly about episode 13.
I guess what I want to say is just, if I had read these interviews without having watched the series, I would have expected the tone of the series to be quite different from what we actually got. Whatever that means.
Once again, pure speculation on my part, please don't quote me on this. I'll have this stuff translated in a few days so you guys can make up your own minds.