I think people forget why alot of the big mom pirates bounties are relatively low and weird in general is because the simple fact alot of them stay in tottoland
Bounty in general is not a representation of your actual strength and danger level but what the world government knows about your strength and danger level. They obviously can only base your bounty based on information they have. Blackbeard being the most obvious example. With being a subordinate giving you an extra boost from your captain
The first example we get on their bounties not being 100% reflective of how strong they are is cracker. The world government doesn't even know what cracker actually looks like with his bounty only being a picture of his biscuit soldier.
Then we have an even clearer example of how even within the crew bounty doesn't actually represent their true strength. Both pekoms and tamago have higher bounties than daifuku and oven despite being weaker.
- Pekoms 330 mil
- Tamago 429 mil
- Oven and daifuku 300 mil each
Could also explain why snack was a sweet commander while having a lower bounty than perospero wasnt. Perospero on top of being older might just be sent on alot more outside missions. Tho honestly this one just depends who you think is stronger
Same with katakuri and how he seemingly doesn't leave tottoland much. That plus the fact even when he has like cracker to a certain extent he never showed his true face, self, or strength. Katakuri in general not only putting alot of mental barriers on himself but has never really gone all out