Holdem taking a L to Otama is also the nail in the coffin for the beast pirates. Embarrassing.
I feel like Gaban has to be the mysterious man in Elbaf.
1) Because the Straw Hats need some disposition regarding God Valley and who else better to tell than someone who was there.
2) Who can explain Shanks true heritage better than Gaban (obviously Rayleigh could).