Oda did no mistakes.
Chapter 500 is mostly famous for Rayleigh's introduction
But in the same chapter Oda let us give a good look at Kidd and Law's crew
Showing clearly Law's jolly roger inside Doflamingo's auction house (some foreshadowing for Dressrosa saga too)
He always had some plans with the WG members of chapter 1000 (Kidd, Law, Killer)
Problem is that most of you were too occupied wanking Zoro and Sanji power level instead of reading the actual story
Personally, I'm pretty sure that Drake too will have an important role, and I have some hopes for Apoo and Hawkins too