Probably because Whitebeard was such a selfless bro to Xebec in the end. No wonder Whitebeard adopted Blackbeard too especially as he did adore Xebec after all, despite his tsundereness.
Whitebeard is such an amazing character and man. I hate him not helping Oden and being too calm about Xebec attacking Loki, but he's definitely like another Harald for Xebec but ride or die, way more loyal to the bitter end.
No wonder the most evil fruit chose Blackbeard. His soul is truly as black or dark as the void, emptiness. A nihilistic bastard.
Him killing Whitebeard so brutally like that and the colder than Kuzans ice betrayal was bad enough (plus killing Thatch and what he did to Ace and causing his death ultimately too ofc) but with all this knowledge we have now, it's so much more gut wrenching, tragic, horrifying anger inducing etc.
Xebec would be immensely ashamed of and absolutely hate Blackbeard for who he is and what he's done especially to Whitebeard.
Never forget Shanks also stopped Kaido going to Marineford somehow. That has new layers, more abyssal weight given what we know about all these Rocks linked figures at the Marineford war.
Fuck man, I gotta give Oda credit, Xebex really feels like a Greek or Shakespearean tragedy protagonist. Some other characters too. A hint of Macbeth for example.
Loses to admiral orange low diff
Orange admiral namis mother or father my beloved.