People thought Aramaki and Issho were defeated or outperformed by the revos, and it turned out admirals fought each other instead. Now they jump to the next off paneled straw, which is Weevil being hostage diffed. Occam's Razor commands that an explanation should be constructed with the smallest possible set of elements. Meaning, if all the info we have is "Greenbull captured Weevil", then there's no need to invent new variables like him being hostage diffed. That is, unless the Manga confirms otherwise. Same goes for his black blade. Sure, maybe it is a wooden stick painted into a black blade, but only after proven so. Until then, we believe our eyes.