Guys , To be honest I also doubt that their bounty would rise more for Pica,Trebol and Diamante.
View it in this way, Doffy the captain and very know super rookie, get hunted by Sengoku, kill one high officer like Corazon, could use birdcage already, destroy cities and killing people, with 31, was "JUST" 340mio worth, with fucking 31 years old, Jack as example with 28 is 1 fucking billion worth, three times larger then the bounty of Doffy.
When Doffy bounty was frozen, Pica was around 30, Diamante was around 35-36 and Trebol even 40 and these guys just have a bounty of 100mio even though beeing very known, I doubt they would get far larger bounty, it doesn´t make sense for such old pirates to get more worth in mio when they didn´t even get much in their best time.
At best Doffy bounty would be around 450-550mio worth, Pica,Diamante and Trebol around 150-200mio at best, we don´t making a illusion up when these guys in their best time didn´t even had large bounties.
Fuck let say that they even get yonkou crew bounty bonus I expect for Doffy at best something around 700mio, for the other 3 around 250-300mio. Oda make it clear that the trio where playing around the same lvl, Pica had a large form but was slow asf, Diamante defense wasn´t the best and Trebol was to into his df, each off them counter themselve:
Pica counters DIamante df>Diamante counters Trebol df>Trebol counters Pica df, these three where around same lvl.
I don´t expect any one of them to reach something above 300mio, even Doffy at best can get 550mio.