Jukka Sarasti and Siri are both a form of AuthorAvatars.
- Szpindel and Cunningham are both biologists, as is the author. Brüks in Echopraxia continues that theme.
Rorschach is capable of communicating.The final lines were genuine symbolic-information-bearing content, but it only communicated for real when the lesser process managing its communications crypsis attempt noticed from the insult that it wasn't actually working. The completely neutral tone of most of the conversation made it seem like it was getting away with the deception (i.e. it was successfully engaging the Gang). Some kind of higher process then kicked in and it either changed strategy, or the more powerful engine finally recognised what was actually supposed to be going on and got it right. Either way, it can talk, but needs to be given a good reason to break its primary protocol before it will try. That's not what it was originally aiming to do.
- ...or it is simply another mode of the 'chinese room', one designed to instill fear and terror instead of merely distract and discourage. It might be merely a threat display, cribbed from thousands of hours of horror movie broadcasts.