Was it said in this thread that the IP addresses were the same on JD and MP? I can only find that dooglus said that AK and dmf used the same IP address, but he didn't explicitly mention the IP nor did he say it was the same as the one on MP. Did i miss that information?
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Can you give us more info about the IP addresses. Either revealing them explicitly or checking if they have been Tor exit nodes at the dates in question?
dooglus and Eric both confirmed the 206.174.121.150 address as having registered on their sites, it was posted in this thread and dooglus confirmed on JD chat. AKcoindigger nick was registered on JD 1 month before DMF was registered using the same IP.
On july 1st DMF used that account on JD, on july 1 that IP was not a Tor exit node, the full list of exit nodes for any specific day and hour is available here:
https://collector.torproject.org/archive/exit-lists/