It does make sense
If you’re a solo guy and if you have a massive organisation you aren’t the same threat level
If Rayan who is a massive pirate and former Shishikukai and former Roger pirate create a massive organisation with Crocodile and Mihawk as allies he becomes a 3B level threat
And it is indeed said : because of his pedigree + and the fact he hit these two to yield to his authority his bounty will be 3.1B
the fact he has now those two under him is included in his new bounty
You also have Brandnew saying : what bounties are we issuing for those three ?
they are just giving them the new bounties
he will maybe have a huge bounty I don’t know
Who knows what the bounty will factor or not and frankly Oda can do lot of things to justify the bounties
According to you:
1. They Updated those Trio's Bounties twice in a single day
2. They gave Mihawk a Higher Bounty than Buggy despite the Bounties being issued "After" Buggy was declared as Mihawk's Leader
3. Crocodile's Bounty was either only slightly increased because of Cross Guild, which means Mihawk's Bounty was also only slightly increased
4. Or it was greatly increased, which means Crocodile's Previous Bounty wasn't comparable to Warlords despite Brannew explaining why Crocodile is individually a Huge Threat (Thanks to his DF & Intellect/Ressources)
... etc
This Massive Organization wouldn't exist & be considered Big if these Founders weren't already Massive themselves,
Also "What Bounties are we issuing" doesn't necessarily mean "Present or Future", it could simply mean continuous present, like if you ask Oda "What Manga are you writing?", it doesn't mean He started now, it's just that He is still doing it, it's an ongoing action,
So that phrase could also mean: "What bounties have we issued for those trio that are still in effect?"
Brannew also had a meeting about Kaidou & Big Mom's Alliance, but did He gave them New Bounties?
They literally created an Army that is Twice as Powerful as One Yonko, yet Brannew simply used their Bounties to explain how Powerful it is, not use such Alliance to justify giving them New Bounties,
Brannew saying Buggy tamed those Two is a testament to his Threat, not an Upscale,
Because saying that Buggy received a Bounty Boost for recruiting those Two means before that, WG didn't think He wd be capable of doing so, then why the hell were They comparing him to Shanks?
Bounty Increase = You've done something that proves your Threat is Higher than previously thought,
If you keep doing things expected from someone of your caliber, you won't receive a Bounty Increase, you are simply further confirming it,