am fairly confident that you have no reasons to explain why it's dumb besides you not wanting it to be true. Katakuri and Luffy may be better than King and Zoro or maybe they're not. We don't know the answer, so to sit here and act like there is no other possibility is irrational. Also, I think you're confusing precog with better reactions. Luffy is able to see everything before non-FS users; this applies to those faster than him too. The difference happens only when reactions are taking place.
You can only react to an attack in the present—most people overlook this. If you're reacting to something in the present physically, then there is always room for others to react accordingly and counter you even if they don't have FS. Luffy saw Hakai coming but he couldn't react on time and risked his losing his life without doing anything while Zoro reacted quickly and saved everyone
Katakuri's whole speciality is his reaction speed due to future sight. Its his main special ability something even rayleigh hyped
Acting like king is anything comparable in that category yes is dumb
Being able to see the future adds to your reaction time giving you more time to react. If 2 characters are the same level and 1 has fs they're always going to react better
Luffy had no need to risk his body when zoro was going to do it instead
They sensed it at about the same time almost; that's the whole point of the interaction. Obviously, Luffy learns it before Zoro because he's got FS. The point here is Zoro was almost as quick as Luffy to notice even without FS.
Luffy told zoro he already knew before zoro mentioned anything so no
Reaction speed and attack speed are different but you use your attack speed to react to attacks sometimes, so there's an overlap here and there. So the faster you strike, the faster you could react. They complement one another. People with FS need to be physically fast enough to be able to react faster than their opponents. This doesn't always work because people can be too fast to react even with FS sometimes. This speed doesn't necessarily have to be movement speed.
Reaction speed and attack speed are not the same yes
Having a fast attack doesn't mean you can react to fast attacks
Being able to react fast doesn't mean you can attack fast
Lol, you don't have to be admiral level to operate at those speeds. You could be far weaker than someone and still have some stats better than them. Marco canonically kept up with Kizaru, period. So if Luffy struggles against the same or if Kizaru's able to deal with Luffy without struggling, then Marco could do the same as far as speed goes.
Marco and kizaru are not comparable speed wise
Kizaru is likely the fastest man alive and a top tier at that. Marco doesn't compare to kizaru in any category
The only thing marco has over kizaru is hes able to regenerate an ability kizaru doesn't have.
Just cause kizaru can push someone doesn't mean anything for marco