What do you mean "least threatening"? Jotaro struggled against him in part 4. However, part 4 Jotaro could easily beat Isidisi, Wamuu, and possibly even Kars, and even part 1 Dio.
@@chrismclean4789 Dio is far weaker than any pillar men, while Jotaro couldn't deal with pillar men since he doesn't have Hamon Have you even watched jojos in the first place?