I think we should take out the villains who we know are still alive like Lotso and technically Blumiere is dead as he was in what I think was the Overwhere or just Some Heaven in the Mario universe and if you had seen or had done the Cipher hunt most of not all the clues point to Bill being alive and also the Axolotl chant if you read the comics and find the one canon thing being the Axolotl and him saying that if he invokes his name he will be given a different form in a different time.