Didn't one of the early Drive interviews specify Chase isn't an actual roidmude? I believe what was mentioned is that he's an android. Both Toei's website and TV Asahi's website seem to support this by listing him separately from the roidmudes.

And even if I think Kiriko would try to protect Shinnosuke, the current situation is pretty much her jumping to certain death followed by Chase simply attacking Shinnosuke again. I don't think Kiriko is that stupid. Or maybe yes. Why isn't next week already, I NEED TO KNOW WHAT HAPPENS )o)