I think with Rocks revealed to have some similarities with Teach , ( both being Ds and having Fullalead/Beehive island as base ) , it's plausible that Teach will be defeated like Rocks , a Marine and a Pirate ganging up on him
I think if it were to happen ,
Pirate = obviously Luffy ( Roger of this generation )
Marine = Fujitora imo . him and Teach have Gravity related powers ( Fujitora controlling Gravity and Teach having mini Black Hole which has Gravity pull )
Also Fujitora is the Luffy fanboy of the Admirals , or Marines in general you might say . also he is tasked by Fleet Admiral Akainu to chase Luffy ( like Garp was to Roger )
i think i'll stand by this for the time being .
While Zoro will handle Beckmann-level Shiryuu , and Sanji handles Burgess with a DF etc.
Don't know what Kuzan's role will be in this but for sure he won't help Blackbeard Pirates
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After this Strawhats will handle World Government in my opinion .
I don't agree with Fuji, being the one to accompany Luffy to beat BB here. Fuji is swordman, and if Oda wants to draw parallels i am sure he would choose a brawler to chase after Luffy, plus Fujitora already allowed Luffy to escape in DR, he is really Luffy fanboi at this point.
I also dislike the idea of Luffy tag teaming BB. It's understandable in cyrrent arc since Kaidou is much more stronger and Luffy hasn't reached Top tier level to solo Kaidou by himself, but BB is an opponents i expect him to solo to solidify his claim as PK. Same for Akainu, Im Sama might be the only exception since he might be much much stronger Antagonist of One piece.
I would like to show my disagreement to Burgess facing Sanji even with Df, i hope Oda don't go that with Sanji BB arc fight.
As for Kuzan, i think he will do what Fuji did in DR. He would act like he is fighting for BB pirates but would go easy on whoever is fighting him and betray BB once he got a good opportunity to do so. Or his role could be much more complex than simply beating BB, he could be leader of this Sword organisation and would let the Marines know of the latest Target BB is trying to aim, thst was shown just 3-4 chapters back. So he might not remain with BB pirates by the time SHs face em.
All things said, if Oda does decide to go with Luffy+ Marine beating BB. Kuzan makes most sense to me.
By taking down strongest Pirate BB, he would show his loyalty as a Marine and his sense of justice never faded, he also had good interaction with Luffy in the past and currently is a spy in BB crew.