Nope bro. Nothing changes even now.
Brannew making all the explanations about CG and there activities before revealing Bounty is the proof that this bounty is after taking into consideration of everything related to these three till present time.
Also if its all about old bounties in the event of Boa and BB in this spoilers than BB's old bounty of 2.24B would’ve been showed. Than again not long before last chapter they revealed old bounty of BB and within few days of events (a week or more) they again updated it by 1.7B when they already declared him yonko before !?
The thing is, Brannew was only explaining about the organization in that chapter.
Especially since Brannew & pretty much everyone knew that Buggy was the leader of Cross Guild looking at that poster, which the Strawhats, Kid & Law and even Crocodile as he is angry about it and shows it to Buggy - all recieved in the current time. They received info about CG like hours to at max a couple days before last chapters events.
In BB's instance also explains what I'm talking about, in the chapter where Yonko bounties were revealed we were merely shown BB's old bounty -something he most likely got when he became a Yonko- while a few days later during the Marine invasion, it looks like Teach has a new updated 4 Billion bounty even though he pretty much did nothing during that time and only raided Amazon Lily & kidnapped Koby.
That's what the hypothesis is about, that we're just shown Mihawk's, Buggy's & Crocodile's existing bounties: when Mihawk & Buggy were disbanded from Warlords & Crocodile's bounty from what he had done for 2 years and we aren't really seeing the updated Bounty of Cross Guild members in the previous chapter.
Besides, what kind of organization would have the leader having lesser bounty than someone who's seen as a subordinate? Which is why it makes much more sense for those bounties to be the ones released back when the Shichibukai were disbanded, it's just a hypothesis for now though there isn't really any concrete proof for that argument although it makes a lot of sense.
Lol. But going toe to toe.....
But i believe there won't be any more reasons than what i mentioned before regarding this cap and sub bounty. Only thing left is Oda's intentions of making gag moments again while toying with Mihawk as usual. Lol
Here shoulder to shoulder mentioned coz of there rank as cabin boy or just the apprenticeship (whatever was that). That's the only time period for which they were together.
Yeah it pretty much said that they stood shoulder to shoulder once although I think the comment is more about what the Marines saw during Marineford when Shanks & Buggy interacted.