Trouble is, with a lot of the characters.....the actors are on contract, the writer does story for other characters, and doesn't know what to do with the ones there already. Notice how "often" you see John? Roman? Rafe? Then they think up something for someone no longer on the show......and so pull them back in. This writer seems to concentrate on a couple of stories, (or one character, such as Sarah) and everyone else disappears. If Chloe does return, it probably will be for just a short arc. But, who knows?