Spoilers so crazy we looked over Law getting packed off-screen lmao
Imo, its one of 2 ways Oda does it
- Offscreen (Kaido to Kid/Hawkins/Etc, BB vs Ace, Akainu vs Aokiji, now seemingly BB vs Law).
- One shot (Kaido v Luffy, Shanks v. Kid, etc).
Its a narrative technique for Oda to hide future fights and surprises that come with them. Imo, Garp being shown now as badass as he is, depending on how much is shown, actually doesnt bode well for Garp.