I think Dragon will have it since he leads an organization that liberates people from the World Government and Luffy having it was said to be understandable given who his father was. Iva leads the Revolutionary Army forces in the Grand Line, was the leader of the Okamas in prison and is the ruler of an island of Okama but even so, I wouldn't bet on Ivankov having it. If anyone other than Dragon were to have it though, Sabo would be my first guess, followed by Iva.