"My friend." Mal had disappeared when Evie had, but she hadn't come back. And Carlos wasn't optimistic about her coming back. If she hadn't when Evie had, then the chances of it happening seemed really low. There was a part of him that held onto hope of it happening sooner or later, but he wasn't paying it too much attention and he was much more interested in making sure he kept what he had.
"One of them came back at least." And she was so important to Carlos that he could almost not mind that Mal and Jay were both gone. Evie was still his first real friend and he didn't know if he could just not have her around.
IT was why Dude had to keep an eye on her when he couldn't.