with no 1vs1 in sight for either straw hat, them could have some oars type battle together, I don't see sanji, zoro, jimbei get huge bounties yet. sanji is known to surpass the previous bounties of Zolo and luffy, so:
77m> 60 m>30m
177m> 120m>100m
330m>320m>300m
now let's say double, 660m or 677m for sanji IMHO. the 4th bounty of luffy was 400m, but since that was special, maybe sanji will surpass the 500m one too.
if kaidou has 4,6 billion bounty, if all SHs team up to beat him, then the combined bounties of all SHs could be 4,6 billion?