Yeah I honestly think he's the weakest Yonko we've seen so far in the series, come at me?! This is gonna be a bit long so bear with me if y'all agree and have the will to read what I have to say. I'm gonna try to make it as short as possible.
Ight so why am I saying he's the weakest Yonko? The man has two powerful Devil Fruits and is a endgame villain sure, but none of that is stopping me from proving why I think (not trying to change others opinions on him, I'm just stating mine) he's the weakest. Besides Buggy, some might say Big Mom is the weakest because of her performance during Wano. I'd like to clear up the fact that despite Big Mom saying she was going all out, she honestly didn't.
If she was, Big Mom would've used everything at her disposal to try and beat Kid and Law. My proof of this is the fact we've seen Big Mom use both advanced conquerors (her 1-3 day clash against Kaido), and advanced armament (her knocking out Page One with advanced armament infused with conquerors). The sole reason she lost was bc she didn't use her advanced haki against either Kid or Law. She did use it in battle, but it was mainly for defense and not offense (could be wrong though). I'm 100% Oda didn't make her use it cause Kid and Law would've deff lost taking constant advanced haki infused named attacks back to back.
I also seen a video saying the weakest Yonko's if they were to suddenly not have their fruits recently and Big Mom was apparently second for the weakest with Buggy obviously being first which is ABSURD! One, even though Big Mom is heavily Fruit reliant, she still has advanced armament and advanced conquerors nonetheless and also has some insane physical capabilities such as her amazing durability, inhuman strength, great endurance, amazing stamina (1-3 day fight against Kaido) etc etc.
Somehow Blackbeard was above her and I don't get this considering this dude hasn't shown any advanced haki feats that I know of so far in the series. He's only shown basic armament and basic observation and isn't even a confirmed conquerors user (yet). He's also pretty dang Devil Fruit reliant (arguably more than Big Mom) and somehow is stronger than her without his Fruits? Nah people be wild 'n if they seriously think without DF's, Blackbeard > Big Mom because of her performance that she had absolutely no control over. And bc of Oda, she's legit one of the biggest laughing stocks in the verse bc of it.
But enough of Big Mom, let's get back to Blackbeard. From what I said above, he's deff seaming like the weakest in my eyes. If this isn't enough, the dude legit ran from an old and retired Rayleigh. Rayleigh himself even stated he wouldn't have won against Blackbeard and yet Blackbeard still ran. At the war, he claimed he was the strongest pirate and what not but didn't want no smoke with Shanks and Akainu and was even afraid of running hands with Aokiji when they interacted. The dude was begging for his life when Whitebeard had him pinned down as well. He also tends to fight characters that are weaker or relative to him in power (Law and or Ace) or characters he has the upper hand against (a Whitebeard that was heavily wounded from the war and was at death's door).
When have we seen this dude actually square up with an Admiral or a powerful Yonko? I'm convinced even Greenbull can beat this dude with how scared he usually be when potentially having to face against really powerful opponents. Then there's the fact this man has one of the biggest egos in the series yet is a huge coward. Like I said before, the dude claims to be the strongest pirate, but will not have head to head battles with really powerful foes. He also tends to gang up on his opponent with his crew if he feels as though the situation is getting dire for him. Granted bc of this, he's the most real life like pirate to others, that doesn't change the fact he doesn't do 1v1s unless it's usually with a weaker foes.
Look, until this man shows me he can 1v1 a really strong opponent like an Admiral or a Yonko (and I'm not talking EOS Blackbeard bc we know he's likely gonna surpass characters like Shanks or Kaido) without any need of help, I'm always gonna consider him the second weakest Yonko. In my book, he's weaker than all of the Admirals we've seen so far in the entire series.. That's why he wins off screen cause he knows he's weak when comparing him to other top tiers. He had multiple off screen wins and only one on screen win which was against Whitebeard (and that's only thanks to him being at death's door). Watch how the first battle he has on screen will be his first and last loss we actually witness? XD