IMO, they're powerful confirmation of a conspiracy to commit the murder of Tylee and JJ in the context of what the jury has already heard about CD, LVD and this group's beliefs in demonic possession, zombies, veils. light/ dark scales and the justification of brutal murders on the basis that such dark, deserted beings are merely empty human shells devoid of memory, feeling etc., and can be voided with impunity -- and so on and so on.
Overheard at a tube stop of cafe -- fine, it's a pair of wingnuts with a variety of influences religious and pop-cultural wagging on in a shared code, blah blah blah.
As presented in this trial, it's IMO crucial evidence of Chad's role as the prime mover of this conspiracy, with the power to designate and describe his victims as beyond redemption and therefore appropriate targets for hitman AC (probably).
There's absolutely no way AC was driving this program of murder -- he had to be told who to kill and when -- and even why, broadly. That's where Chad and his dubious "gifts" came in.
Scapa's Snap Verdict -- to the pokey for life, Chaddo!!!!!
EDIT: Not good on the dates for JJ -- no idea of the importance of this mistake, but yikes.