It's what i think.
Shiryu just isn't Mihawk, bro.
I'm not following your argument.
Someone as powerful/balanced as Zoro suffers vs Shiryu precisely because Shiryu can exploit the one facet where Zoro isn't balanced.
Weaker characters can actually do better than Zoro vs Shiryu, if they are able to counter Shiryu.
For example, if Shiryu was supposed to fight a different Zoro (hypothetically if he has same CoO as Garp showed this chapter & no CoC infusion), Shiryu would still get beaten.
The growth that Zoro underwent in Wano, is pretty much irrelevant in the Shiryu fight - is my point.
I can't think of many characters that are much weaker than Zoro that would be able to defeat Shiryu. If Zoro is running into a problem despite being so balanced, then characters weaker than him aren't going to be able to solve it, that's what it means to be balanced. Just because Zoro has not mastered observation doesn't mean he doesn't have workarounds like AOE, reactions, speed, skill etc.
And honestly I don't buy Shiryu being weaker significantly weaker than Zoro in every way possible and Zoro still gets beat down, if you're saying he will struggle only a bit then I can see the case you're making, but if Shiryu's devil fruit is simply that busted to the point he bullies Zoro for that reason alone, then it would apply the same way to anyone else (who doesn't have the one counter to Shiryu maxed out, and there aren't many of these characters most of them would sit in the top tier realm). Remember I'm speaking under the premise that Shiryu pushes Zoro as King was doing, I'm not talking about some stupid ass Pica type fight.
Can you give an example of characters who would be able to defeat Shiryu but are much weaker than Zoro? What would they have, that Zoro lacks? I can give you
maybe Katakuri if he manages to counter invisibility. But that is an absolute anomaly who is maxed out in observation and reactions, and I consider
that a mismatch for Shiryu rather than Shiryu being a mismatch for every other non top tier in existence, and that's only given the info we know about Shiryu rn not further reveals.