Buggy and Teach grew up and became Pirates same time as Shanks.I don't see how Buggy mirrors anyone. He's a wildcard if not a Joker. Lol
Shanks became a Yonkou while being young.
Now all 3 of them Yonkou.
Big Mom and Kaidou grew up and became Pirates same time as Whitebeard.
After Rox were defeated. Sea was ruled by WB, Shiki and Roger.
Later all 3 of them became Yonkou.
Thats what I mean old Yonkou mirror new Yonkou.
I won't be suprised if we get an EoS timeskip, if the sea is ruled by Luffy, Law, Kidd and a new youngstar!.
Whitebeard -> Shanks -> Luffy
Kaidou/Big Mom -> Buggy/Blackbeard -> Kidd/Law
Shanks -> Luffy -> New Youngstar