Someone on Twitter guessed that D5 = Durham. Q posted the pic of George Washington crossing the Delaware on Durham boats. Another “clue” was in a Q post where he dropped the “d” in the word suppose. Thoughts?
In Pursuit of Truth had something on that a while back.
They guessed D5 = Durham + 4. And the revelation came to the Anon when he realized the tie into the picture Q had posted of Washington crossing the Delaware.
I think it was a brilliant and very plausable possiblity. Don't forget Q's info generally has more than one meaning.