I'm so hyped for Captain John and Kong.
Cpt. John... his design already looked dope in Thriller Bark. I bet he was one of the most feared under Rocks, when Linlin and Kaido were still young. Probably right below Newgate and Shiki. I mean, a subordinate known with the 'Captain' epithet says a lot...
Kong... I never lost faith in his relevance. He is now Supreme Military Commander in Chief, he was Fleet Admiral 27 years ago (Edd War) so he was probably an Admiral during the God Valley Incident (?)
If that's the case he probably had a code name like all Admirals (Animal + Color) and he sure as hell was the previous Monkey. The color could give us a hint of the nature of his power...