it was waltz even according to greenberg.
https://archive.ph/RFqeE
things we don't know:
why did waltz add greenberg
was everyone else in the group legit
were there any other "mistaken adds"
why didn't greenberg ask waltz directly if he has his signal contact
the more i think about it the more it smells funny. initially i thought greenberg acted apropriately, and maybe he did bc from his perspective this was weird as hell and probably felt like a scam at first and a setup once he knew the info was real.