He could do that, I just don't see why he has to do it. Wano isn't the final arc and there will still be at least a few arcs before Luffy fights blackbeard.
The straw hat pirates do not need to become the equals of the beast pirates in wano kuni. Especially since we will likely have an arc against the marines right after in order to save Sabo.
Hence, given how these characters stand currently, I think its far more likely that they fight weaker characters and take on people on the same level as the tobi roppo next arc.
rapid, erratic, powerlevel jumps aren't a good thing
I'm not saying they need to become equals. I've been arguing for years at this point that Luffy would not take down Kaido alone. Big Mom being present just solidifies that for me (that it's going to a massive chaotic shitstorm of a battle). I've also been arguing that there are plenty of arcs/plotlines left. But there is a point where strawhats, even the weakest ones, won't be overshadowed by supporting characters. Giving them insignificant fights against lesser BM children does not make sense to me.
Realize there are nearly 30 Names arc villains this arc:
- Kaido/BM
- BM's Sweet Commander: Smoothie
- Kaido's 3 Executives: Jack, Queen, and King
- BM's 5 Monster Ministers: Snack, Perospero, Campote, Daifuku and Oven
- 5 Tobi Roppo, discounting Drake who will likely betray them
- 9 or so Numbers (assuming they are 2-10)
- Kanjuro
- Onibawanshu (count them as one)
- Mimiwarigumi (count them as one)
That's 28 characters/groups of characters. And this doesn't include other lesser headliners or BM children likely to take up panel space. There aren't even enough people on the alliance side to take on the above if the 6 weaker Strawhats do NOT participate in the above:
- 10 strawhats
- 8 Scabbards + Shinobu
- 6 Supernova (sans Luffy/Zoro, assuming Drake, Hawkins and Apoo ALL betray Kaido).
That's 24 right there, and sure, add Carrot or Wanda or Shishilian or the Yakuza bosses, hell even add the Whitebeard captains, it still is a terrible assumption to think that 6 Strawhats wont even fight against any of the 30 referenced villains above and will fight someone "lesser" than these.
Does it make sense for Oda to spend dedicated chapters having Nami fight Galette, a character not even hyped in her own arc, while a supernova takes on Ulti or Black Maria, characters who clearly are centralized ito Wano's plot?
Hell, let's just assume that:
- Zoro v. Who's who
- Jinbe v. Sasaki
- Sanji v. Drake
Is what you are expecting, then who fights Kaido's 3 Calamities? Who fights BM's 5 monsters and 1 sweet commander? Who fights the numbers? We need to stop assuming these characters are "weaker" than they are implied to be.
Oda has never truly adhered to power scaling, his main characters seem weak when he wants to show off the villains (I.e. Lucci and Blueno recking everyone or Perospero trapping Chopper/Brook) or make a situation seem hopeless. His main characters are much stronger when he wants them to grow into the next phase of the story.