Its ok not to trust nefario but what you are saying will actually lead to the point were nefario wont give out any more payment nor the assetinfo. And you know that he wont give it out. So just in case nefario made this double payment on purpose to not have to give out the assetinfo you quite perfectly play his game.
And till now nefario showed that he wants to pay back. As far as i read there are paid back not small amounts already. Even though only getting 90% of the btc back... the assetinfo is worth more for the assetowners. Its worth nothing to nefario.