First off - Ryuo is just the term Wano people use to describe "Haki", so yes Zoro had Ryuo coming out of the timeskip. Luffy, Zoro and Sanji all did.
Yes, I know that Ryuo is the name that the people of Wano use to describe haki, I get it ok, jeez. You can't even imagine how tired I am by telling everyone that I know about it, at this point all active one piece fans know about it.
What I meant was the "flowing haki," unfortunately there's no official name for it, so I use the name by which it was described in Wano.
On what grounds?
On the grounds that Luffy, Zoro and Sanji's specialty is CoC, CoA and CoO accordingly. Throughout the post-timskip it has been even more fleshed out by Sanji who managed to avoid Katakuri's jelly beam, Zoro who managed to cut steel in "Alabasta, Fishman island and Pank hazard" which requires Ryou [flowing haki] to do that, Luffy who has been actively using CoC since Fishman island. Oda himself has confirmed it in SBS, saying that "Luffy's specialty is conqueror's haki, Zoro's specialty is armoment haki and Sanji's specialty is observation haki." Based on that I truly believe that Sanji has advanced CoO, Zoro has advanced CoA and Luffy obviously has advanced CoC.
You think pre-Enma Zoro would be able to take down Katakuri with Future Sight?
Zoro fans claim that Enma isn't a power up, although I don't really agree with them, I don't blame them ether. The problem is, is that Enma hasn't shown anything that Zoro couldn't do without it: originally it was said that Enma forcefully releases excessive amount of haki, but since Zoro tamed the blade we haven't seen him using excessive amount of haki even against Kaido and Big Mom. When an Enma user uses excessive amount of haki, his body or "at the very least parts of his body" shrinks in size because the blade sucks the user's life force/haki, but after Zoro tamed Enma it never happened again.
If there isn't any concrete evidence that Enma has enhanced Zoro in some way, shape or form, then based on the things that are as of right now, with evidence that we have today, and the things that we know in this particular moment, then I have to conclude: that yes, pre-Enma Zoro can defeat Katakuri. If Oda shows what Enma has given to Zoro in the same way he's done it with Sanji's raid suit, then I would change my mind, but now I have to agree with Zoro fans.
Okay this really confuses me. On what grounds would you be able to say that, for example, Mr. 1 was weaker than Zoro BEFORE they fought? The reason we can say "oh Zoro is stronger than them" is because he defeated them. Before the fight, it's anybody's guess. And actually, Zoro could not cut Mr. 1 until the final moments of the fight.
Mr.1 couldn't ko Zoro with so many attacks, the entire fight was Zoro enduring Mr.1 attacks, the dude had very, very weak offensive power compared to Zoro who literally oneshoted him. Like honestly, as soon as Zoro awakened Ryou he oneshoted him, Mr.1 couldn't take even one attack from Zoro when Zoro managed to endure all of his attacks.
This massively underestimates the growth Zoro has gone through in Wano alone. He's spent most of the arc fighting and training, and he's also been given Enma which has increased his destructive capability by a lot. He's significantly stronger now than he was at Return to Sabaody.
I've already said what I think about Enma, so I'm not going to reapet myself here.
Also, we haven't really seen that much of King's combat capability yet, so we don't actually know how strong he is yet. It's definitely too early to write him off.
Zoro is already badly injured, that by itself means that King isn't strong enough to push healthy Zoro to his limits.
This statement vastly overestimates the power gap between Yonko and Yonko exec, and also vastly overestimates Zoro's current level. It also underestimates the combat capability of Yonko execs. Zoro damaging Kaido doesn't immediately mean he's at Kaido's level and stronger than the rest of his (Kaido's) crew.
the fact that already injured Zoro will defeat King means that Zoro is stronger than King.
Also, bear in mind that Zoro's end goal isn't to take down the strongest right hand men - it's to take down the World's Strongest Swordsman (Mihawk). Theoretically, he should surpass most of the Yonko execs based on that.
Of course he should, but not now! Zoro should surpass Yonko execs in the fight against Blackbeard. Blackbeard's crew is going to be the strongest Yonko crew and that's when Luffy's crew will surpasse Blackbeard's crew.
I just don't get why Zoro fans wanted him to fight against Kaido, why the fu*k it was important for them, for what fu*king reason???