Just like Law's Gamma Knife (with biggest room) , Luffy's G4 (Boundman) and upcoming awakening , Oda is also saving somthing cool for Kidd.
And it's gonna be more exciting since we haven't seen anything (except Attract and repealing power) from Kidd
Oda gave Law hax powers that bypass almost every durability.
Oda gave Luffy Ryuo to hurt kaido
Oda will give Kidd awakening or some skills that can bypass durability
With Law , it's just his ultimate attack that hurts within
With Luffy, it's advanced COa
With Kidd, it will be Awakening... where he can manipulate magnetism from within someone's body.