Blackbeard will be the greatest Pirate antagonist that Luffy will ever have to face
Kidd is Luffys biggest rival out of peers or fellow Super Rookies. His “frenemy“ like a Vegeta character pretty much
This is obvious and the difference between the two. They don’t play the same role in the narrative. End of story
BB = Rocks
Kidd = WB/Shiki
You don’t hear people in the OP world going, “Rocks is Rogers rival, not WB/Shiki”, do you?