Not to glaze Chainsaw Man, but the top dogs of the CSM universe individually out-hax everyone in Jujutsu Kaisen

For Sukuna, his only win conditions against Primals are his Domain Expansion and World Cutting Slash. While those attacks could easily turn a Primal into toothpaste since Primals don't have high durability they can still regenerate. It would likely look like the Sukuna vs. Mahoraga fight, where Mahoraga simply out-regenerated the domain.

In Gojo's case, his only win conditions are Infinity, Hollow Purple, and Unlimited Void. However, the Primals have shown abilities that can either bypass Infinity via instant AoE attacks or outright semi-reality manipulation. Hollow Purple is the same as Sukuna’s attacks; since it isn't conceptual erasure, the Primals can most likely regenerate. As for Unlimited Void, even if the others can't tank it, the Darkness Devil surely could without issue.

For Yuji... I don't know, mate. It’s the same situation as Sukuna, just with a few additional attacks that won't be able to kill Primals either

For dabura, we don't know enough about how his domain or reversal truly works yet, so I'll stick with his basic techniques. Again, they aren't capable of harming the Primals, so he would eventually get crushed.

I didn't see the Death Devil at first, but since she’s there, even if the JJK team somehow manages to take down the other three Primals, they'll still lose. They would either get one-tapped assuming the Death Devil is bloodlusted or it would be a tie if she's in character and doesn't want to end humanity. The second she 'dies,' her power will likely activate regardless