There's only been one case I'm aware of where a site was penalized in search rankings and filed a lawsuit. That site lost. The only complaint that the judge seemed to find valid (although ultimately dismissed) was anti-trust allegations. Microsoft wouldn't be in that position in search.
In short, there's no legal precedence for filing damages if you're dropped by a search engine. It would be hard to imagine what, if anything, Kogan would argue successfully.