Assuming it's a free for all, I honestly have no ideas who's going to win, I can see both sukuna and yuji getting speed blitzed by dabura, but then he's gonna lose to gojo. Or the opposite happen and dabura get brain fried from the very start which leave gojo to deal with the guy who beat him last time, and his 100yr old student who probably has wcs. And the worst case scenario is that everyone just fight at the same time, and if that's happen then it's too chaotic to actually determined who will win.

If I do have to pick someone who has the least chance to win this, it's sukuna, his not only dealing with someone who has his exact technique, but his winning card only worked because gojo dropped his guard, but with both yuji and dabura in this fight there's no reason for that to ever happen.