I don't know. This is a massive red herring imo. Like, Yuji is resolved to die. And him dying will solve their problems pretty much. I imagine Kenny would have near impossible chances of Sealing Gojo again if he gets out, not to mention defeating lol. And Sukuna will die with Yuji, so the only other being that could possibly match and defeat Gojo dies for Gojo to get unboxed.
So, if that happens, it's pretty much game over for the villains, (unless they have other stuff and people on the level of Gojo/Sukuna which I very much doubt at this late in the game. )
So, considering all that, the scenario of Yuji sacrificing himself seems like a way too easy ending for the good guys. There WILL be some wrenches thrown. Some twists.
Is Sukuna really gonna let Yuji kill himself like that?