I always assumed Hilldog or LDR, but could be the Merk.
Alex probably has spoken with him in the past. But now he's no longer grata as an intermediary.
If you listen to the Joe Rogan Alex Jones interview, Alec cites Q back in Feb 2017.
Listen during the first 5 seconds of video.
I'm not weighing in on sides, divide and conquer and all the rest. But he mentions a "Q" for sure.
BZ is also Bravo Zulu, which is Navy code for "good job"