This does make an interesting follow-up in a way, zeppelin might learn hamon, future passes. Pillarmen show up and now zeppelin has a reason to pursue the stone and their mask. With both (if Jonathan manages to remain alive even if deep in the grave) hell it's implied Jonathan is somewhat alive, just burned to near death like dio was at the start of the second arc of part 1. There is a possibility of ultimate Jonathan to be a thing.