@Reborn people say the BBP mimic the Rocks' pirates, etc etc.
But there are key differences.
While the Impel Down people kinda act insubordinate like the Rocks' pirates were said to, or shown on that god valley page, the OG4 from the BBP are actually 10000% loyal to Teach straight up. Lafitte even threatens Pizarro in Marineford.
And I think this is gonna be a key difference in why Teach is gonna reach beyond what Xebec did. Xebec was probably betrayed and abandoned in God Valley, but Teach actually manages to earn his crew devotion. Which is why I'm not on the "Aokiji betrays or is betrayed" train.
I dont care about "big war scale" or whatever. The most anticipated clash on this manga is and has always been, SHP vs BBP.
It's the Roger vs Xebec of this era.
Now, if Coby is gonna play the same part as Garp, who knows. But Teach is still a much better antagonist than mr secret boss that appeared 1000+ chapters in that no one asked for.