Both are not true and you know it. If it was other way around would you say Lucci low diffed Luffy and that Zoro could not push Kaku to anything? Never, you would not. And that shows y'alls bias.
Luffy vs Lucci was dominated by Luffy but a pretty equal exchange (even an equal clash) and both not even close in going all out. Eventually the fight was interrupted. Similar now with Kaku and Zoro. Both fights werent even close to the end. In a fight characters get blown back all the time, both sides. We have to wait and see how Kaku vs Zoro looks like visually, but I doubt it implies a win by Zoro.