Zoro seemingly managed to speedblitz Hybrid Kaido whilst standing in Asura mode, and albeit I agree that Asura likely augments his speed stats it's quite unlikely that his Base form stands massively behind. Hiryuu Kaen is not a particularly fast attack and Kaido managed to dodge it but Shishi Sonson is most likely a different story when it comes to processing speed as well as energy output. King travelling faster than Zoro doesn't mean that Zoro's CoO/reflexes + unleashing his moves can't hit him swiftly, conversely. He even proved to likely possess a better CoO than Luffy when it came to challenge Dragon Kaido, in fact the latter would fail to properly protect himself from Blast Breath in one instance, while Zoro displayed how easily he could react.