My prediction for Blackbeard Pirate Bounty's. Following this crew hierarchy ofc
Blackbeard — 4,194,200,000
or 5,100,000,000+
Shiryu of the Rain — 1,700,000,000+ to 2,100,000,000+
Avalo Pizarro — 1,450,000,000+ to 1,950,000,000+
Jesus Burgess — 1,220,000,000+
Either Blackbeard keeps his current bounty or it's raised to be just above Whitebeard's 5B bounty and when Luffy beats Teach, his bounty exceeds Roger's 5.5B bounty.
IMO Shiryu's bounty shouldn't exceed Yonko Teach's initial bounty. He hasn't done anything as an underling to push him above that. Also, I think Zoro has to have a lower bounty than Mihawk's 3.5B going into their final fight.
Pizarro's bounty is guess work. Sanji's opponent should be stronger than King and should have a bounty decently above his previous enemy, Queen. Shouldn't be 2B but I can see it getting close.
Burgess is more guess work. I picked 1.22B because it's a nice, chunky number that's above Jinbe's current bounty but doesn't quite exceed the top officers of other Yonko Crews. Which is where I think Burgess will more or less fall.