The only big mom pirates in this fight are big mom and perospero.
Franky vs Holdem, the guy who literally had like 5 chapters devoted to him to set up his importance and power so that Franky could have a fight with him, he's a headliner, ie pretty much the next best thing after the tobi roppo, essentially the equivalent of people like Pekoms and Tamago. Holdem is based on wwe wrestlers (which fits the theme of a franky fight), has a lion wwe belt that punches his balls (matches the comedy of a franky fight), and can shoot giant explosive fireballs (a parellel of franky shooting lasers), the fight will be heavily cqc based with both using their ranged attacks here and there.
https://i.kym-cdn.com/photos/images/original/001/404/396/dff.png
Robin, Raizou, Shinobu, and maybe like Usopp's opponents will be the Oniwabanshu. Robin and others have had interactions with them and they have plot relevance, they also are the top ninja of wano:
https://static.wikia.nocookie.net/o...Infobox.png/revision/latest?cb=20200927045557
Brook vs Sheepshead (who is a headliner):
https://i.ytimg.com/vi/J58oVqs8Q5s/maxresdefault.jpg
https://static.wikia.nocookie.net/onepiece/images/1/15/Sheep's_Horn.png/revision/latest/scale-to-width-down/340?cb=20160501111902
Chopper vs Hatcha (the strongest of the numbers, and the most prominent), monster point vs giant
https://static.wikia.nocookie.net/o...est/scale-to-width-down/340?cb=20200609204722
Luffy isn't Kaidou leveled
Zoro isn't King leveled
Sanji isn't Queen leveled
etc
The point of this arc is that the strawhats NEED the allis, and the allies NEED them. The arc where the strawhats do what you claim is when they fight blackbeard, that'll be their first yonkou crew they 1 v 1, this arc is a group effort. Also Marco, Kid, Law, etc are all future allies who will be massively important for the final war against the world government. This is literally their arc to shine before they dissapear for like 5 arcs.
But yeah, none of the strawhat enemies are weak, they just aren't going to solo the beast pirates. Also the enemies the strawhats are fighting are the ones who've got a shit ton of focus narratively. Holdem, Sheepshead, etc, despite being weaker than the tobi roppo, have effectively gotten more screen time than them. Sheepshead was literally jack's number 1 and played a big part in zou. Holdem had a whole little story arc where they were in charge of a region and luffy went to confront him. THe oniwabanshu have been given proper attention and have had multiple skirmishes with the strawhats at different points. (like zoro has 1 or 2 of them at the bridge, they had that whole giant palace thing that involved robin trying to infiltrate and them getting in her way, likely a prelude to robin and co teaming up to defeat them and their leader, who was raizou's old rival and who has had 20 years to train since then to at least get a bit stronger)
Like, these aren't scrub characters. Bobbins solod new world kingdoms and pretty much every single character is stronger than bobbins besides the weaker oniwabanshu (and they are more of a package deal to their lead). The oniwabanshu fight will be a lot of gimmicky tricks and glass canons, which feels like a perfect place for robin, nami, and usopp to be. Like they'll be dropping smoke bombs and dynamite, using gimmicky devil fruits ie "ninjutsu", etc, and it'll be a very dynamic fight for them.
Honestly, not only do I think the power scale matches mine more, I think my idea on fights is just a much more interesting situation, also it doesn't make sense to give usopp and chopper more powerful enemies than luffy's rivals and marco.
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You do realize for that to happen, blackbeard would not only have to surpass someone stronger than a pirate king more or less, his crew would have to consist of people on the level of prime whitebeard, prime shiki, prime big mom, young Kaidou, Prime John, Prime etc.
It's just not happening. Also if the strawhats defeated that force, the world government (the actual final villains) will be steamrolled besides Imu. Because like, the final arc will essentially be Imu, Cp0, maybe the Gorousei, Akainu, Kizaru, and that's about it (bar misc vice admirals and below), vs Strawhats and ALL of their allies on the kingdom, pirate, and marine side (smoker, drake, ishoo, etc will be on their side)
So nah, blackbeard pirates will rival the other yonkou crew, in the end, luffy really only has to be like elite yonkou level to even defeat imu. Kaidou is like the 3rd strongest character in the one piece world, following Imu and Garp. (living ofc)