I thought its pretty hard to guess how much was paid back because he used some kind of anonymizing chain system with the addresses to pay back.
(...)
Care to explain where you have this numbers from? I mean even nefario didnt claim that he already paid back 90% of users money. Which would be a good thing to let go away accuses of he being a scammer regarding the users money.
There is no any anonymization, apart of the Bitcoin mechanism itself.
The chain is an effect of using a series of commands to perform the payments - one transaction per a payment, instead of one transaction for a group of the payments.
When you have a transaction identifier of a payment (like at the beginning of this thread) or a blockchain address (like above) of the payment or double payment,
you can quite easily trace at blockchain.info the chain back (where came the money from) or forth (where went the rest to).
Looking at the chain starting from the 1000 BTC you will see there is a row of smaller transactions, where the main quota is getting smaller and smaller, and each transaction forks a smaller amount into different address. When you look at these addresses, you will see that near all of them has received this smaller amount twice: the first time on 16th Oct (from one of the big chains, starting from 5000 or 3762 BTC) and the second time on 18th Oct (from the chain starting from 1000 BTC).
Many of the transactions were confirmed by people here, so I'm convinced I'd guessed it right.