Re the toppy thing, I think Jack does come across as extremely toppy there, but only WHEN he eventually comes out and only really towards Gwen. I find it quite telling that Ianto, who isn't Gwen's boss, is the one running after her, and it kind of looks like in that hothouse, Ianto's the one in charge and taking the initiative. When Jack eventually follows Ianto's lead, he suddenly displays himself in a very sexually agressive manner, but it feels to me like that's very much a thing he's directing at Gwen.