It's you who brought up this dumb "if he will skysplit only in GV against Roger"
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Xebec didn't skysplit, not while he dwarfed the effects of every other skysplit, and not when he and the strongest King of Erbaf put Imu's CoC range to shame.
Xebec doing it only against a pirate It's the end of the agenda
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As said, better hope he doesn't or does with Garp, if not you will never hear the end of it