so, yeah, finally found out jack's pl, pre-omnia, and now makes sense, even before the final dlc against au mateus, he easily defeats gilgamesh, gil even says, that jack might be the garland he knows, but has yet to become, so yeah, he says also is the same gilgamesh who travels through dimensions, through the depths of time, etc = at least planet level+/sub-relativistic+, not bad, as for hax, jack was countering spatial/dimensional based abilities too, from various opponents before, can create bfr portals, etc
means, jack really solos clive land (ff16 top tiers max at planet/planet+ levels/low sub rel levels), even pre-omnia gains at this point, jack is actually quite strong