Also just because it was just introduced doesn't inherently make a power up random. Think about Nightmare Luffy, Enma or the Raid Suit. All make sense even though they were used shortly after being introduced.
Nightmare Luffy makes sense more or less. We learnt how Moria creates Zombies, by giving them a shadow of another Person. This also leads to their strength ''combining''. Giving a shadow to another Living Person, should have the same effect - what it actualy did. This also was a temporary PU. Doesn't mean it was a good idea. The SH's lost to Oars + Moria. Luffy wouldn't be able to win that solo. Solution? Stuff so many shadows in Luffy as you can - boom! Hulk Luffy! Problem solved...great...
Enma. Well, what a coincidence. The SH's are going to fight Kaidou in WANO. He is a Yonkou, nobody could ever kill him. Luffy in G4 couldn't even Scratch Kaidou. But guess what! There is a Sword, which was the
only one ever to give Kaidou a scar and how surprising! the Sword is on WANO! WOW! Enma is such a deus ex machina, it's ridiculous.
RS - don't have anything to say to that. Besides Trash - especialy Story tellingwise.
Also Luffy won't solo beat Kaido even if he gets a power up. He'll get to be the last man standing but it'll take a group effort to weaken Kaido.
That's what i hope. But Luffy learning advanced haki in a week, Hawkins ''Limit breaking'' powers, which will definetely Play a role - why introduce such power if not used? - also + the normal ''Luffy gets stronger in fights PU''.
Looking at the other People, what role should they Play against Kaidou who one shotet G4 Luffy? Luffy learned advanced Haki to get pass Kaidou's ''iron skin'' and to block his attacks and Luffy has FS too. If the others doesn't have something comparable to that, hard to imagine how they should not get one shotet. Oda made the difference too big, now he have to solve this Problem. Looking at the Katakuri fight…i don't have high hopes he will solve this in a Logical way.