. Okay so 8th Day crushes a nerfed Kuurth.
. Full powered Kuurth has an enchanted weapon, Cyttorak and Kuurth are working in unison. I don't believe that Cyttorak unknowingly gave Cain as much power as Cain willfully took from him on the 7th and 8th Day though. I would easily place 8th Day as being twice as powerful Classic sans FF, while being just as tough.
. Classic eventually wrecks nerfed Kuurth because he just keeps coming back due to the FF and strength backing.
. 8th Day throws Classic around for eternity, as neither would ever get tired. 8th Day probably wins due to being the overall most powerful.
The question here is that force field's toughness, vs how tough 8th Day's toughness was in comparison to it. I saw Thor give both pause with his best shots. Both times, these shots were barely noticed.
I have to go with 8th Day on this one. I think that he had more overall power than any Juggernaut outside of Piotr's full released form.