I'm sorry, that's an unreasonable interpretation of what's going on. Diggle isn't a "shipper" because he isn't some random person on the internet. His interest is in seeing two people be happy and functional, which is in the best interests of the team. Right now, the writers of the show have written the characters in a way that shows they care about each other. You may disagree with that decision, which is fine, but, once they do that, it's logical for other characters to pick up on that and want those characters to be happy. That's all he's saying - "Look, if you care for her, you need to tell her rather than start breaking things at HQ." That doesn't sound unreasonable to me.
Yeah, that's what I saw. Her combat skills were decent (probably due to her police training), but she didn't do too much with the bow.
Then again, I didn't see Roy do much with the bow last season that suggested an "expert" and I really only saw one good shot this season.