Tbh I don't think that healthy Asura Zoro's attack would be much stronger. The narrative was that Zoro uses one last all out attack before his body shuts down.
It's similar to Hadrujin having his entire skeleton shattered to bits by Machvise's 10.000 tons and pulling through by punching Machvise to the edge of the birdcage.
@ShishioIsBack
Well if we going Adv CoC route that makes sense but in that regard at least Healthy Ashura would last a lot longer so Zoro can smack Ashura hits on Kaido a few more times..3 or 4 is all it would take
But Zoro's statement and events followed could be listed as follows
-Zoro has very tiny amount of strength left. 5% maybe
-Zoro said he will put all his remaining strength in one blow. 5% Strength
-That blow is effective but not enough to finish Kaido
But if Healthy Zoro put all his strength into one attack it would be far far far above 5% Zoro putting all his strength
Again because Zoro literally has to use his physicals and dude could hardly more