Yes, it was fanservice. The feats are clear.
-Kid and Law forced Big Mom Conqueror's Haki use, in the roof Kid seemed like he did barely nothing to them. How is possible to force a Yonko to attack and defend with Conqueror Haki while some minutes before you were doing barely anything to them while they were not even defending (Kaido only dodged once, Luffy's Red Hawk).
-Law used Gamma Knife ONCE, against the only thing that it was useless. A super giant serpent with hundreds of meters long while his attack is like a half meter. Why using it against their human/hybrid forms?
-Law could have teleported SN since the start and dodge the Hakai. Zoro wasn't needed there at all.
-Kaido could have use Thunder Bagua since the start and his human mode, Killer and Zoro would have been done since the start. He let them attack for free and then went in his worst form for combat so he can take all attacks for free.
-Law's ability retconed. He could move Doflamingo with Shambles while at the same time he couldnt cut him since Doffy had enough lvl of CoA, but here he couldn't move Yonko.
-Zoro barely moving by Hakai but King sent him flying away, twice, with a frontal attack. Why? So Zoro had his moment.
-Luffy unable to dodge Ragnarok, an attack where Kaido jumps up and falls by gravity but he could dodge Thunder Bagua and fight on equal grounds against Kaido in that department like we saw later... Why? Well, so Zoro had his moment, again.
-Big Mom doing shit in the roof and then going serious only in her "official" vs.
The evidence is pretty clear.
Sorry Zorotards, but it's what it is. Making a thread and gathering all Zorotards so you can lick your balls between everybody, like trying to prove that you are right by making your subspecies move their head like a duck and repeat "yes" to your thread, is not changing anything.
Let alone when you didn't post any argument aside from
"is done by author", like he was some perfect human being and doesn't make mistakes lmfao
And even better, thinking that marketing does not exist in this industry and does not affect how the story goes on, how gullible.