Nothing about this is 'pretty much confirmed'. The only thing that is confirmed is that Killingham is afraid of Zaza.
Even if there is a devil fruit of that model, we've seen a likely candidate: Monkey D. Dragon.
Much as I appreciate theories, please don't act as if they're certain, let alone "all but confirmed." This is as bad as pretending things are 'official' because you've found a piece of evidence to support your pet theory.
