To be perfectly honest with you, for some time now Blackbeard smells like Rocks in a body vessel type of thing.
I know I'm not the first one to theorize this ofc but I think I see a bit more thru Blackbeard's writing and I will genuinely be surprised if he is not at least Rocks' son.
Fits the narrative, too: Luffy inherited Roger's Will and is Garp's Grandson, while Blackbeard inherited Rock's Will and is connected to him somehow.
I believe in the Blackbeard has the Cerberus Fruit theory, and that Rocks had the same Fruit, as well. Kaido and Orochi's Fruits are broken as hell, but the ability to eat two other fruits (most likely one of each kind) is even worse.
The faster Blackbeard shows up, the better, people clearly want to focus on a new antagonist/an antagonist that's been hyped up. If we spend 20 chapters fighting Weevil, or, like, trying to get Weevil's pet cat out of a giant tree, I'm actually going to lose my shit.
I think Blackbeard will steal Shirahoshi, attack Whole Cake for its Road Ponyglyph, attack Sphinx to steal Ace and Whitebeard's corpses and make them zombies, attack Zou for its Road Ponyglyph, then Wano for its Road Ponyglyph, a translator (Sukiyaki?), and Pluton. Boom, Blackbeard goes to Elbaf with three Road Ponyglyphs, two Ancient Weapons, and a translator. COME ON ODA, GIVE US FUCKING BLACKBEARD