Hm, interesting, but I think it's a little too high for Cook. His should be 1.330 billion for now at least (having his above Katakuri's alone is pushing it, imo, and definitely not above Marco's or current Luffy's).
Your Zoro's bounty prediction is massive there at 3.2 billion (I have his between 2.12-2.5), but understandable due to double ZKK.
You think Luffy's will reach 4 billion?
Well, Katakuri simply set the bar too low and we cant be limited by his number.
Of course, Sanjino having a higher bounty doesnt mean he is stronger since match-ups are everything.
If he beats the 1.32b guy, it's expected that he gets more though doesnt have to be the case.
Yes, Zoro's bounty is massive but I think it is fair for the one who takes Kaido's head. Luffy's is going to be 5bil.
I think Oda wants to make Luffy with 5bil and Zoro with 3.2bil to parallel their DR bounties - 500mil and 320mil.
After Wano, Strawhats are the mighties pirate organization in all the seas, wild bounties are to be expected.
Regarding Sanjino's bounty, I think Oda wants to transfer the 2000-1000 men strong gag into their bounties.
So, he gets half of Zoro's bounty and at the same time, if he gets 1.66bil, he has the Germa number in his bounty.
And since he likes to complain about his bounties, 66 is the perfect reason for him to be annoyed.