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You might be right, we are trying to figure out if he changed his name in the past, because that would be just another piece of evidence.

Another weird coincidence with him is that he doesn't even have a wikipedia page despite being on GQ's top 50 people in Washington. I find that very odd to say the least.

It is indeed strange that the 49th most powerful person in D.C. according to GQ doesn't have a Wikipedia page. There is a page for Comet Ping Pong though. I'm sure you've seen this photo Jimmy posted on his instagram of the man wearing a J'❤️ L'Enfant t-shirt. It appears that a number of people have assumed it's James/Jimmy himself wearing the t-shirt when it is actually Christopher Lynch, co-owner of the L'Enfant Cafe & Bar in D.C.
http://www.washingtonblade.com/2014/02/18/boom-time-lenfant/