I think it is the opposite, ofc Luffy is not strong as Kaido but Lucci and co will realize why Luffy is a Yonkou.
I think Lucci will end up as hypetool soon, one shot once Luffy pull out adv CoC.
First Bonney and now Lucci, they don´t understand why Luffy became a yonkou, he will show them why he is called a Yonkou.