To get it out of the way no not in strength. Kuzan is clearly a lot stronger
When I say Kuzan = katakuri and Yamato I more so mean in role he’ll play
Both katakuri and Yamato were the top dogs of their respective pirate groups with them choosing to side with Luffy by the end
Imo either in elbaf in preparation to fight the rest of the bbp in the next arc or even within the same arc Luffy will reunite and clash with Kuzan. As for how much of a fight idk probably more than Luffy vs Yamato which wasn’t really anything but less than luffy vs katakuri where luffy was fighting an uphill battle
Point is Kuzan blackbeards top guy will have a scuffle with luffy and choose to back him instead of his captain
Just like katakuri and Yamato did