I agree and he has plenty of feats for that but thing is luffy did CoA punch and gets panel getting him compared to top most people... luffy did CoC punch and gets 1v1 with kaido.... zoro replicated a feat which oden couldn't do but yet he is not given respect he deserved... not one panel... it was CoC coated slash which was not done by luffy yet Kaido revered luffy.... I want to grandmaster to slash Kaido's neck but all the 1v1 win luffy and momotaro trio plot then big momo plot with luffy theories are making it subdued ... we still dont know why zoro wants to be strongest... he wanted it before kuina's entry... but we never got the panels.... kaido only has oden and luffy on his mind even after the slash...
Also a general perception is captain strongest ... any enemy fought till now had captain strongest and luffy got him as opponent... I accept SH will be anomaly but it has to be reflected in opponents as well... zoro mid/low diffing most fights with less stronger and luffy high/extreme diffing more stronger doesn't do it clearly... Oda gives zoro feats but he gives luffy monologues.... and most fandom takes monologues as crucial instead of actions... WG is atleast better in a sense because yesterday I saw someone say zoro stronger than luffy on reddit and it was a rampage..
It is true, the hype through words goes to Luffy, it has always been like that, even when people talk about Zoro.
For example, when Supernovas see Zoro's bloodlust when he was about to kill a Celestial Dragon they hype Zoro's captain for having such a man in his crew. Luffy shakes Kaido's head a bit and he asks if he is as great as other legends while Zoro cuts him open like one of those legends and he says nothing much. That is fine, Zoro cant have it all, Luffy is the MC after all.
Even when Zoro kills Kaido, Luffy will be hyped because a man from his crew did it. Luffy usually gets big names to fight while Zoro fights their henchmen but if people pay close attention to it, those henchmen are always bad match-up for Luffy, way worse than those big names which he ends up fighting. Zoro's purpose is to protect Luffy from the things which he cannot do himself. Hakai is the perfect example. Fandoms usually lose it when you say Zoro>Luffy but Oda isnt part of those fandoms, he is just telling a story...
Still tho, saying openly that Zoro is stronger than Luffy and wanking Zoro to high heavens is unlikely to come directly from Oda, he is usually very subtle about it, like "Do not speak ill of Zoro"... Each era had a great pirate and another guy who was stronger than them and held World's Strongest title and still, Oda didnt undermine the weaker one. I dont think he will undermine Luffy either, Whiskey Peak is perfect example.
Greatest Pirate of the Era - Strongest fighter of the Era
Roger - Whitebeard
Big Mom - Kaido
Shanks - Mihawk
Luffy - Zoro
Roger, Big Mom, Shanks have never been undermined despite Whitebeard, Kaido and Mihawk having the World's Strongest titles.
Luffy wont be undermined either, Oda doesnt benefit from it, he wants his characters to look good. Strawhats are an anomaly, the greatest pirate of the era and strongest fighter of the era are for the first time on the same side. They will go one step further and not just be the best in their eras but in all the eras ever. There is no greater pirate-leader than Luffy and there is no stronger character than Zoro.