I don't own naruto six paths nor i plan to get him.

If you read my previous posts you would know i gave to a lot of people tips to beat him.

Anyways the reason why naruto six paths will survive against ronin up to round 3 is simply the fact he selfheals too much thanks to the enemy move 2/3/4 low substats.

Beware that i was generous when i said itachi edo tensei would survive up to round 3, if he is not that stacked could be he is dead round 2 directly.

Ronin naruto against naruto six paths works exactly like an hokage minato supported by an asuma wind blade and by a bee sst that give him the second standard attack.

Against a comparable power naruto six paths the hokage minato blitz do not win in any ways before round 3 and most of the times go to round 5/7 and generally minato wins because he dodges the first attack, imposing so on the enemy naruto to use standard first, then mystery, that grants he won't have mystery the following round even on round 3, but during the rounds naruto cannot immobile him he hits him with two attacks FULL TAI after mystery popped his dodge.

Ronin doesn't have the self dodge and as you can see in the pic:

His standard attack is NIN so only his mystery gets advantaged by the self boost.

So, against naruto six paths, he will work way worse than hokage minato is able to do right now.