This is how I would have done the bounties
(still keeping in mind that bounties aren't power levels)
LUFFY = 4,500,000,000 -> Strongest member of the Pirate-Ninja Alliance by far, unlocked Nika Nika awakening + Adv CoC, defeated Kaido in 1 vs 1, plus all his previous achievements
ZORO = 1,920,000,000 -> Luffy's close right hand man, overwhelmed fellow Supernovas, fought very well against Emperors, defeated Kaido's number two in 1 vs 1, unlocked Adv CoC
SANJI = 1,330,000,000 -> Third strongest Strawhat, defeated Kaido's number three in 1 vs 1, Germa/Vinsmoke affiliation
JINBE = 825,000,000 -> Fourth strongest Strawhat, defeated Kaido's number five in 1 vs 1, former Shichibukai
NICO ROBIN = 800,000,000 -> Ohara survivor, plus she defeated one of Kaido's strongest crewmembers, albeit with help
USOPP = 532,000,000 -> God Usopp thing
FRANKY = 522,000,000 -> Defeated one of Kaido's strongest crewmembers without help
NAMI = 310,000,000 -> Nami
BROOK = 303,000,000 -> Brook
CHOPPER = 1,000 -> meme
LAW = 3,000,000,000 -> Unlocked Ope Ope awakening, was one of the two who somehow defeated Big Mom in 2 vs 1
KID = 3,000,000,000 -> Unlocked Jiki Jiki awakening, was one of the two who somehow defeated Big Mom in 2 vs 1
KILLER = 1,185,000,000 -> Right hand man of Kid, fought decently against Emperors, stomped a fellow Supernova in 1 vs 1