Beating a Yonko Commander is no small feat.He should at minimum get a bounty at the same range of King.
general reasoning would agree.. but like stated.. characters gets bounties lower than the bounties they win against.
like Buggy + Kreig + Arlong = 52 mil
Luffy gets 30mil
Daz bones = 75mil
Zoro gets 60 with the knowledge of him whopping 100 pirate hunters in WP
Katakuri + Cracker = 1.8 bil +
Luffy gets a 1 billion increase almost half as much with the knowledge of his altercation with Bug mom
So if we take Luffy as an example to argue zoro off given luffy is the only one who's bounty has been jumping after his 400 mil which he got in TS.
Zoro defeating a 1.3 bil character + side feats like fighting Kaido.. zoro's increase would be twice as much as he has which goes in lock step with Luffy's pattern that he follows... Luffy got twice as much as increase from his initial bounty of 500 mill which made it 1.5 bil
with that same pattern Zoro should get around 600 - 700 to potential 800 - 900mil bounty increase compared to Luffy's 1 billion after WCI
for sanji it seems sanji will get a bounty under a bil for sure now that try to reason it out