It can go that way. But there needs to be a passage of wills for Blackbeard. His ship name is also saber of Xebec. This isn’t an idol fight. One piece is about inherited will. Of Xebec is alive, then who’s Will is Blackbeard protecting? And my thing is the lurking legend refers to the Rocks Pirates. (1) connected to Whitebeard bc that was his crew (2) will be luffys greatest battle (3) includes Big Mom and Kaido (4) It was such a legendary battle that it had to be scrubbed out of history. WB May have known that fruit. And he makes an ominous remark about the wounds on shanks face, makes WB ache. Could be referring to Blackbeard and also the Rocks crew. Finally Xebec needed to chain down all those devil fruit users to obey him, especially since they all had CoC. So it was easy with the Yami Yami No Mi. Not to mention a crew of devil fruit users sinks in battle, that’s why there’s so few remnants