Really thought we would get a short flashback on how Luffy got beat.
Last time we saw them fighting, Luffy was struggling to cope up but somehow managed to fight Kaido one v one for atleast 20 minutes. He needs to improve his haki durability imo. Fight between top tiers last for a long time. Fight between admirals lasted for 10 days, Jinbe vs Ace lasted five days, BM and Kaido casually fought for three days. Unless one is highly superior to another, fight between two equal top tiers last for days. Luffy's G4 won't last more than 30 minutes. He has to train his CoC and use it more naturally inorder to sustain and fight against top opponents