Harald vs Xebec Outcome is what would happen if any of Roger Re-Skins Fought each other, but People are too emotional to accept that.
Xebec is Harald Re-Skin,
Garp is Xebec Re-Skin,
Roger is Garp Re-Skin,
Rayleigh is Roger Re-Skin,
Gaban is Rayleigh Re-Skin,
Oden is Gaban Re-Skin,
Garling is Oden Re-Skin,
Shamrock is Garling Re-Skin,
Shanks is Shamrock Re-Skin,
Beckman is Shanks Re-Skin,
... etc
They are Peak Humans who Fight with their Peak Willpower in the Form of Adv. CoC.
While WB is a Re-Imagining of these Characters but with a DF,
With BM, Kaidou, Sengoku, Blackbeard being his Re-Skins ... etc
The Rule is Simple,
Any Adv. CoC User who manages to reach Prime & Human Limit (And if They ate a DF, it must be of Highest Level) is considered a 100 in OP.
Adv. CoC Users in their Prime = Pirate King Level (They are all Equals)