I just 'ship for Hoshi and Malcolm because the scenes we did see them in had a nice chemistry, IMO. There was a training session with hand weapons, the mess hall scene in Silent Enemy, and when Hayes prepares to lead the MACOs in rescuing her in Zero Hour, Reed wants to go along because Hoshi is his friend. Clearly, he does care about her.
Oh yes, agreed; they all really care for each other. They're a family.