First of all, Gege isn't a "This is my Ultimate Form" Mangaka, this isn't One Piece.
His fights are more about Ability Interactions & a Fleshed Out Powersystem as well.
Secondly, Yorozu was a Sorceror who reincarnated for the Sole Purpose of fighting Sukuna at his Strongest.
She basically didn't give a fuck what forms they fought in, all she cared about is whether Sukuna is using Shrine or not.
Because the bodies does not matter at all, All of these Reincarnated Sorcerors can switch to their original appearance easily.
Ryu, Uro, Kashimo all already look like their Former Selfs in their reincarnated Bodies.
It does not affect Powerlevel, the Cursed Technique & the Jujutsu Sorcery Skill carved into the Soul does.
Gojo literally at the start of this Fight taunted Sukuna "Why are you fighting with this Face? You think i won't go all out?".
It absolutely does not matter in Powerlevel.
we know sukuna has been holding back his abilities
ultimate form stuff ? we literally saw yoruzo pull out an entire insect armour
there is basically no reason to think that 4 arms arent more advantageous for sukuna than 2 arms
thats literally how his og form fights
cursed tools in 2 arms while the other 2 are for cleave or hand 2 hand
him having 2 arms doesnt give him the advantage of versality
and we also know that sukuna has not used his entire shrine ability , it has just been dismantle and cleave
gege is literally hiding his abilities from us and he is also making a fool out of characters who think sukuna's ct is just slicing and dicing like jogo
if u think gege is not gonna show us sukuna's og form in this era then u are in for a rude awakening
same for him fleshing out his cursed technique where god knows what things sukuna is keeping
simply thinking shrine is just limited to cleave and dismantle is jogo level iq and ignoring sukuna's powerlevel.