>>283049777
Everything has mana in that world (apart from isekaijin like Nanahoshi), and battle aura although never really explained this way or in full detail I would think of as magic for retards or an unconscious kind of magic. Therefore I think even comparing complete non-combatants from the 6-sided world with a non-combatant from this world, say someone who just lived his life working on a farm: the 6-sided dude is going to be stronger, because he has some amount of mana and probably after however many hay bales lifted developed not just physical strength but also some very low-grade battle aura that boosts his strength further.
All that being said lets not pretend Rifujin is a master level worldbuilder, he is not. His power system/balance isn't even particularly well thought out as it relates to creating a believable world (high tier battle aura users are just too powerful, as are high tier magic users, and its a wonder there are any functioning nations at all and not just constant cataclysmic warfare in the world). Considering all other creatures and races in that world, and their capabilities, logically speaking humans in that world should be extinct save for divine intervention.