He's still ridiculously strong because he still has insane strength and chakra levels. He has very high skilled Taijutsu and large scale Suiton techs. On top of that, he has above average intelligence and speed. Also, he still has the power to absorb chakra, he's shown it from sucking chakra out of those chakra strings when used against him during the fight with Guy without Samehada.
I would still put him as a S-rank ninja for sure, if you give him Samehada, he's just above the standard of S-rank.
I would still put him as a S-rank ninja for sure, if you give him Samehada, he's just above the standard of S-rank.