Anyone without an agenda can tell, Zoro beat Kaku worse than Nika beat Lucci.
1. When Nika was pummeling Lucci, neither Lucci, nor Kaku or Stussy who were watching, tell the Seraphims to interfere.
Meanwhile, Zoro clashed with Kaku briefly, and Lucci panicked badly he told all the Seraphims to interfere.
2. When Nika came, Lucci himself dared to fight him directly. But when Zoro is bullying Kaku, Lucci got scared he could only tell the Seraphims to do the job. Lucci himself doesn't even dare to interfere.
3. Kaku got weakened so bad Stussy managed to one shot him. Just see whether she can one shot Lucci too next chapter. Spoiler: she can't.
Meant Kaku is in worse state against base Zoro than Lucci against Gear 5 Nika's named attacks.