When I say "Luffy won't struggle", I mean that this won't be Luffy vs Kaido.
The reason behind this has nothing to do with powerscale but purely on the narrative.
The narrative is very clear.
- Luffy and Zoro have to reassert the yonko status of the SH crew by showing to Kizaru and Lucci that they are facing a yonko crew, not the mere pirates they were 2 years ago
- The Sunny is being moved to the other side, this can go relatively quick and the fight has to finish by then
- Elbaf has already been announced and we already know the next destination, although Egghead was not finished yet, this can imply that the arc is going to follow next, in a near future
- The Egghead incident has already been mentioned multiple times, and now we are simply witnessing it, the timing of the events implies this is going to be relatively short
Wait, aren't you a little preoccupied with this Yonko crew status narrative?
Luffy is not strong enough to beat Kizaru quickly in the short time it takes for Sunny to move out.
And if Lucci is petty enough to say that Luffy is not a Yonko despite getting mid diffed by Luffy, I highly doubt that any less than a low diff loss to Zoro will convince Lucci that Luffy is a Yonko.
And, like I said, Luffy needed G5 to beat Lucci, so a fight between Zoro and Lucci is a high diff at least and extreme diff at worst, which still won't convince Lucci in the end.
Besides, Lolda can easily drop this Yonko status plot point, like he did to a shit ton other plot points in Wano, to justify both Luffy and Zoro needing extreme diff to win against Kizaru and Lucci respectively.