I don't know how they decide bounties, I just keep track of them.
[But yeah there is still so much wack shit he could hit you with but isn't. He's being polite.]

The fleet admiral is Sakazuki now. [Said with a not intangible amount of disdain. Fuck that guy.] Sengoku is still around though, he's just semi-retired. I actually met him on Dressrosa.

[He assumes it is implied, by him bringing him up, that the meeting allowed him to become aware of the former fleet admiral's specific connection to Rosinante.]