Luffy isn't using CoC Coating or his Most Powerful Techniques
Zoro isn't using CoC Coating or Asura
Lucci isn't going All Out, He is literally only using Shigan
Kizaru is only using his Signature Moves, not his Ultimate Techniques
Even Seraphim barely showed their Full Potential, nor did Oda bother to include Jinbe & Sanji ... etc
I can't believe that even after 1000 Chapters, People still don't realize that there are Major Arcs where We witness All Out Fights
And Smaller Arcs where it's basically just Build-Up & Stalling & Teasing ... etc
Egghead Arc is like Long Ring Long Land, SHs meet an Old Man who needs Help leaving the Island
But They are Interrupted by Foxy Pirates/WG
Round 01 of Foxy Games --- CP-0/York/Seraphim Sub-Plot
Round 02 of Foxy Games --- Don't let Lucci/Kizaru Kill Vegapunk
Round 03 of Foxy Games --- Saturn Sub-Plot
Then comes this Arc's Equivalent of Aokiji back then, and just like Aokiji was interested in meeting Luffy after He heard about him, this New Villain also left his Comfort Place to meet Sun God Nika (Hence the entire reason why Gorosei were absolutely against Nika Poster)
As
@ConquistadoR said, this entire Fight is Stall Piece, as simple as that