Status: True
Unfortunately, Rickon only came out for a short period before meeting a gruesome end in the Battle of the Bastards. So long, little guy.
Original Theory: Rickon has been MIA since parting ways with Bran, but many believe he ended up at Bear Island (home of the Mormont family) or with the Umber family. With an imminent "Battle of the Bastards" between Ramsay Bolton and a revived Jon Snow for dominion of Winterfell, it's extremely likely that Rickon will return — either as a bartering chip used during this battle for the North or as a reminder to Stark lieges about who their true leaders are.
