@sanji''s_dad:
they both start with P so its easy to get them confused and i have said before that one of the level 6 prisoners most likely can read them and devon could be because she could be robins match up but i think she will be matched up nami now since nami normally fights the female of the crew plus her early design had her looking more like a cat version of nami so i could see her having a cat zoan due to her early design lame i know but i am getting that off her early design also if the new member of blackbeards is not aokiji then it could be another female for robin to fight the final fight with the blackbeard crew might not have everyone matched up based on their jobs of the crew such as brook who plays music vs lafitte since they both use canes (he is a navigator). luffy,zoro and usopp however will fight based on their roles/fighting style on the crew.
It wasn't my intent to offend you by naming the 3 AWs. I just wanted to explain their names and where Oda has got them from (I'm interested in greek myth, especially since "God Of War").
Also I am with you about Brook VS Laffite: Similar weapons, one's a musician, the other is a dancer, one can fly, the other can jump high, cause he is just bones, both are from West Blue.
I also think that Vasco could be Sanji's Opponent. For sure Vasco has some sick "Drunken Monk" fighting style and among the newer BBs he gives me the most "cook-vibes".
I can understand that the BBs have established the most Fitting opponents for every single SH and it will be the most awesome 1on1 fights we have ever seen in OP, but that Argument alone does not give me the ultimate reason that the BBs are the total last enemies of the SHs.
The final war might not involve every single SH, but in a war there is not everything about 1on1-fights. It's also about using Brains and take Advantage to get the upper Hand. This final war would involve so many People (the SNs, remnants of the current Yonkou, the Sichibukai, the navy, CPs, every army whose Country got saved by Luffy) that Oda might not even Focus enough on every SH. Oda stated that the last arc will make the summit war look like "meh…" and only the war I described above is able to do so.
--- Update From New Post Merge ---
I know your concerns:
How can a final war-arc work without a proper 1on1-fight for each SH?
Well, some of the SHs' specialty is not fighting itself.
Nami could manipulate the weather at the war causing storms and what not.
In the end I could see her take on Eneru. She knows enough about weather and lightnings to overcome him.
Usoppe could use his God-title and his Relations to Elbaf to lead a giant-army against the WG-giants (if there are more than this navy giant squad).
Franky Shogun could take on John Giant. We have met him even before BB was mentioned. Therefore a well-known marine.
And if you wonder that would work, remember EL. Usoppe had not an own 1on1-fight, but was he useless? No, he literally saved Robin's day that day.
As Long as each SH Plays an important role in that final war, they Need no arch-enemy to take on. Well, except the Monster Trio + Jinbe.