User blog comment:MeltingMan234/List of Banned Characters in the comic/@comment-5487126-20131124062004/@comment-4728637-20131125025203

I don't think it means that Mighty and Ray are gone forever, rather they simply are not part of the Chaotix. If the comics are trying to become closer to the games (which seems obvious at this point), then they simply left after the events of Knuckles Chaotix.