There was also this in response to the "is it possible that they are both just using the same exchange to dump their currency into?" question:
i dont think so. thats not how exchange wallets work. although a member of the staff could confirm if any wallets in the alleged chain belonged to them.
I think clueclub is the guy who put us on Marc's trail to begin with. Maybe he's right and we need to start a spreadsheet linking transactions.