I would Cinta to say Luffy, but the truth is, I don't know. We never saw the full extent of Kid's power to begin with! And who knows how strong he got after 2 years in the new world. He is one of the people causing the most trouble in the new world. anda gotta be pretty darn strong for that. So, I am looking ke hadapan to a One on One between Luffy and Kid.
Luffy. Everyone seems to forget that Kidd got his outrageous bounty for mass civilian casualties. Luffy is without doubt the strongest supernova, especially with haki, close saat would be Law, simply because of is hax opi opi no mi. Then zoro, x drake, Hawkins, THEN Kidd