Blackbeard and Luffy represent the new gen pirates. Before new gen. There is mid gen or current gen. A pirates that become big after Roger death. That's kaido,shanks,mihawk,moria, doflamingo and such. Kaido and shanks is both apprentice of Rocks and Roger. The connection
is there. So both kaido and shanks is mid gen or current gen of Roger and rocks. Luffy beat the current era of rocks in kaido. Blackbeard should also beat the current era of Roger in shanks. So when Luffy meet Blackbeard. They represent new gen rocks vs new gen Roger. When they fight each other. Both already surpassed kaido and shanks. BB beat shanks is inevitable.
is there. So both kaido and shanks is mid gen or current gen of Roger and rocks. Luffy beat the current era of rocks in kaido. Blackbeard should also beat the current era of Roger in shanks. So when Luffy meet Blackbeard. They represent new gen rocks vs new gen Roger. When they fight each other. Both already surpassed kaido and shanks. BB beat shanks is inevitable.