So if Shoichi's is the bottom route, Jun is the top route, and Keisuke is the verse route, does this mean power bottom Haruki incoming?
I suspect Haruki will be the top when the relationship between him and Yuu gets that far. As far as power bottoming I would find it to be strange for Yuuichi to be a power bottom when he is very timid and slow with intimacy in Sho's route. It be kinda silly if Yuu is that cautious with someone who has been his best friend since childhood, but then throws himself into Haruki's lap after just starting to get to know him. But who knows maybe the wolf is just that irresistable.
I agree with this. Most likely the issues his father caused, completely destroyed his mental health and he doesn't want other people to suspect that, therefore he puts up this facade. I believe he will open up to Yuu very soon and show his softy side. Another commenter mentioned an asexual relationship, which would also be a valid assumption.