Again, since they all hung out together on that one shopping trip he can sympathize with his losing Alice. It doesn’t feel as strong though, since Alice seemed like a pretty tough cookie and is probably taking care of herself. He doesn’t always appreciate Oz’s cheerful disposition nor his sense of humor but he has grown accustomed to seeing him around. If Oz suddenly disappeared it wouldn’t go unnoticed. I wouldn’t go so far as calling Oz a friend, but really Ciel doesn’t consider many people friends at all. There does seem to be something different about Oz, but Ciel isn’t sure what that is and hasn’t made the time to figure it out as of yet.