It's not exactly like that, considering is the mind of Lucemon in well...fucking Ogudomon X and Alphamon didn't battle him but is explicit that Ogudomon is superior to Chronicle X Alphamon. So yes Lucemon solos and if we using a composite he has the god factor as well and thanks to that he didn't have concept of damage.
Also with the composite we have crazy shit's like True Demon Lords the ones who Yggdrasil need to split them in all the multiverse to prevent they doom the continuum space time of all the universe and multiverses of Digimon. And Re Digitize Barbamon with nearly all Demon Lords powers in the post game.