I'm pretty sure that the sub file for 5 isn't mistimed (I used the saiyaman raw).

Yukimura:

Neither is wrong for wanting what they want, but someone will have to compromise if either of them is going to get what they want from eachother. From what we've seen I suspect Itou is more motivated to take actions that might lead to sex then Katsura is motivated to take actions that might lead to romance, but at least they are both trying. What throws a wrench in the works is the fact that Itou's desire for sex doesn't hinge as much on Katsura specifically, and Sekai is shaping up to be a much more responsive partner. To be fully realistic, Katsura's desire for romance shouldn't necessarily hinge on Itou either, but the whole 'mysterious train watcher' element is part of the romance and thus he does fit more into her scenario then she does into his. There's also the fact that there's not really any other viable males in the story anyway.
I know there isn't anything wrong about wanting to have a relationship purely for sex, but after watching episode 6, I think Itou is certainly turning into a terrible person. He doesn't end his relationship with Katsura and is making things worse for everyone. Watching Katsura fall more in love with Itou is terrible.

I guess you could argue that he's inexperienced in breakups, but I feel like he's hoping that Katsura will get "in the mood."