I find hilarious that the whole purpose of Kamutoke was to avoid Higuruma took one of Sukuna's techniques. It literally appeared some chapters ago, and It wasn't so useful for Sukuna in combat. I mean, Yorozu used a Binding Vow to finally create it, and in the end we didn't know what exactly does the weapon, It Just seems to fire lightings and That's It.
Talking about Itadori It's cool for him to finally get something new since a lot, but sadly it's not enough to be a threat for Sukuna. I hope the fact that Yuji was training With Kusakabe means he could have learned how to use the Simple Domain or those new arms are not Just a simple cursed tool and is something related To the Death Paintings.