^^
For those who don't understand this.
You should read this
http://tech.eu/features/808/bitcoin-part-one/ 
Why input is so important ?
Input
An input is a reference to an output in a different transaction. Multiple inputs are often listed in a transaction. The values of the referenced outputs are added up, and the total is usable in the outputs of this transaction. Previous tx is a hash of a previous transaction. Index is the specific output in the referenced transaction. ScriptSig is the first half of a script (discussed in more detail later).
The script contains two components, a signature and a public key. The public key belongs to the redeemer of the output transaction and proves the creator is allowed to redeem the outputs value. The other component is an ECDSA signature over a hash of a simplified version of the transaction. It, combined with the public key, proves the transaction was created by the real owner of the address in question. Various flags define how the transaction is simplified and can be used to create different types of payment.
from
https://en.bitcoin.it/wiki/Transactionsthe transaction spend from multiple addresses == a common party controlled those addresses [xc mixer, single wallet]
the transaction spend from multiple addresses =/= a common party controlled those addresses [coinjoin and variant]
As stated here.
So when you send from original address A to the receiving address D , it goes to the mixer B, the mixer makes a new address C to send the amount to the receiver D? And Chaeplin doesn't get only A?
And chaeplin is adding that the mixer only uses one address for you, so once you know A, you can trace it. Which is what I said before. You have to assume A is known.
that is not how the mixer work's
The highlevel summary is this
The mixer tells the client to send coins to wallet b, however wallet C is used to send coins to the final user, there is NO link from wallet B to wallet C unless somebody manually moves the coins from C to B
Owner of Xnode should know this, for privacy of xnode user.
* Do not spend coins.