David Seaman? I checked into his shit from when he first stepped into PizzaGate and then looked into his back story. This Reddit thread supports what I found. He's just another one put in place to poison the well:
David Seaman is a Fraud, Ties to George Soros
https://www.reddit.com/r/conspiracy/comments/5uk42a/david_seaman_is_a_fraud_ties_to_george_soros/