This discussion has given multiple pointers to @vycl87 to explain what happened. He can simply explain how that transaction happened where funds from both addresses belonging to two different persons have been transferred to a common address. If vycl87 had explained the technical details behind it, that alone would make him technically worthy enough to be a merit source. The most likely scenario is that they generated two addresses from the same HD wallet. @vycl87 gave it to @koincik to use. (paying off a loan or whatever).

Though in that case, there is no reliable wa for them to prove that they are different people. There have been such cases in the past when people just post same addresses and find nothing wrong in it when they do it. Is there any bounty rule in the Altcoin sections that every user should use their own wallet and not share addresses? Catching alt-accounts is going to get harder still because these people are just gonna learn from these mistakes. They probably feel that it is only fair if they can operate multiple accounts without getting caught. Like Polar91 said in his parting message. This truly feels like a problem with no solution. Vinny Lingham was going to do something about this identity thing with Civic, yet like so much else, it is just another WIP.