We don't see Sukuna use that fire thing back when he first killed Mahoraga, we don't even know how tf he did that. He can use piercing blood and Megumi's technique, does it stop there or can he go as far as manifesting Megumi's domain, all of that still up in the air.I like how the fights aren't straight pulled out of ass. They have already been well established and we are well informed about the techniques they are using, the fights are written properly and by no means it breaks the scale of power scaling, can't believe it's a shonen manga.
Also, Imagine taking over a body with potential to defeat Gojo and adding your cursed techniques yet getting your ass beat so badly. That makes me think Sukuna could've never stood a chance of he used his real body or didn't summon Mahoraga, his whole fight was dependent upon the latter, yet he has balls to call himself "Strongest of all time."
It's an imitation piercing blood Sukuna came up with by substituting the Kamo blood control with the elephant shikigami's ability to create huge floods of water. It's more like an improvised waterjet cutter.sorry if i missed this somewhere, was it explained why Sukuna can use piercing blood? i thought that was only a Kamo clan technique
so it was true then..RIP Gojooh boy are you in for a surprise