Well I do think sword will be involved somehow don't know loda's plan with coby but I don't think he is fighting a commander Maybe he goes against Teach helping luffy who knows or have some words with aokiji
About the rest I think is going according to the bountys
Zoro Jinbe cook and robin
Shiryu burguess/pizarro and Devon
Wich imo makes senses since burguess is captain of the first ship while Shiryu second just like marco and oden and pizarro was with Shiryu showing his powers with the mision of protecting behive and taking down garp & crew
With Brook I don't know what loda planning since the treatment towards him sucks
And actually find funny than nami & Ussop are fighting the most BBP competents with broken abilities
(Yes I'm dying on nami vs laffite hill)
And imo Coby’s role being defeating Pizarro is the perfect continuation of his story as if he was stronger, Garp wouldn’t have had to sacrifice himself to create an opening against Pizarro for the ship to escape.
And eh I’m going to stick with the groupings:
Blackbeards first four commanders -> Luffys East Blue male allies (Nami imo isn’t going to fight a man)
Burgess -> Sabo : Burgess and Sabo both have unique relationships with Blackbeard/Luffy and they have history together
Zoro -> Shiryu: Obvious
Usopp -> Van Augur: Obvious
Coby -> Pizarro: Stated above
Sanji -> Lafitte: One of each crews top dogs, and with Pudding in the jail the demon sheriff known for his brutality against prisoners and Sanjis tendency to rescue women in his fight just makes this fight make sense
Level 6 Prisoners Iva called out -> Straw Hats that defeated Tobi Roppo
Devon -> Robin: Woman fight with both being assassins
Sanjuan -> Franky: Battlefranky vs Colassal Battleship
Vasco -> Jinbe: Crews two strongest drinkers and Vascos ability to manipulate alcohol will probably be a good counter to Jinbes fishman karate since mixing alcohol with water causes it to evaporate
Then there are the odd ones out
Doc Q and Stronger -> Brook and Chopper: Oda just doesn’t respect these two as fighters to have solo fights imo and with Brook and Q both having death symbols and Chopper and Stronger both being pets with zoans seems like a fitting fight
Nami imo will fight York. The Blackbeard pirates are here for something and it’s likely the seraphim. Plus with York will likely see them as a way to escape egghead and thematically both are “abandoned their family” for greed but for Nami it was just a front so nice little parallel there and with the seraphim York using children as weapons would go very well with namis character.