I agree and have said in prior post and in other posts that yes…we cannot confirm he is in this world, nor if he is alive. It was claimed that Rumple has lived for centuries and is only alive due to being possesed by magic. Bae is confirmed to lack magic so…..that makes him several centuries old. There is that room with 20 doors but only 16 doors are showing as previously mentioned. He could potentially be in one of twenty worlds but I do not seeing anyone that is several centuries old except for the remaining members of the Rolling Stones. Yes I agree there is absolutely no confirmation as to the fate of Bae. In fact the return is the only episode that he’s really mentioned in SB, while all other appearences and references were in FTL.