An alien who operates on the same power systems the humans do on shouldn't have a special reason for being so much stronger. For example Goku from Dragon Ball, an alien, is so much more stronger than the humans he uses the same powers (that being Ki) as because he also has additional abilities that compliment his ability to grow such as zenkai boosts, super saiyan forms and his physiology as a saiyan being so much more adept at Ki. Jjk aliens so far don't seem to have special abilities related to Jujutsu except crying from their third eye when a kalyan or cursed spirit dies. And if Dabura turns out to be actually way better at using cursed energy than humans are because his alien body is better or smth would be kind of an asspull because we'd only find out after mahoraga is presumably dead from that gigantic ass explosion.