Scopper Gaban probably owns the Oro Jackson, he can be the man marked by flame, He was Roger’s navigator probably and that’s why there are the giant whirpools described by Lafitte, Scopper can take advantage of his experience as the Pirate King navigator.
The Oro Jackson is made with the Adam tree, it’s one of the strongest ship ever made. Shiki lost vs Roger for a sea storm, all Shiki ships destroyed and the Oro Jackson survived, It’s not a coincidence