You're totally ignoring what I'm saying: It's not a nothing at stake attack. That's a technical term. You have a stake - even if you short it.

Secondly ... come on guys: I buy 51% of a POS, then I buy again 51% of the value as shorts (well, more - as I want to make profit). And then I make an attack? Genius! You just managed to make the same fricking attack we knew all along worse, since you have to invest twice as much.
It also contradicts itself - since you fudded the currency into junk to get your stake, you don't even need to attack it. And you probably wouldn't get anyone offering you shorts.