Zen must have had to have read their minds at some point when Blake, Jenna and Avon boarded, because he projected images of Avon's brother and Jenna's mother being hauled away by Federation stormtroopers while on the bridge; and don't forget the three soldiers/guards who went across before Blake and the others. It's a telepathic ability not shown again.
Not necessarily. Since the victims were experiencing
their own memories and fears, it could simply be that the defense systems triggered their brains' fear responses and stimulated them to hallucinate whatever they feared or despaired at most, letting their own brains do the work.
I also think it's likely that Zen and the defense mechanism are independent subsystems. There's precedent for this in all the times Zen refers to the ship's battle computers, navigation computers, etc. performing their own separate calculations. Zen doesn't directly perform every shipboard function, but is more like a coordinator and supervisor of a team of separate computer systems. So if the defense mechanism did read their minds, it could've done so independently of Zen, and whatever data it gathered about its victims' memories could've been scrambled when Blake blasted it, so Zen wouldn't have had access to it.
The sequence of events in "Cygnus Alpha" is very clear: Zen is silent at first, then Jenna gets her hand frozen to the controls and describes feeling her mind merge with something else, then Zen starts speaking English immediately after that, and a little later volunteers the name
Liberator, which Jenna says came from her thoughts. The explicit intent in that episode is that Zen only read Jenna's mind.
You would think Anna Grant would be a stronger emotional connection to Avon than a brother who is never mentioned again.
Yes, but they hadn't created Anna Grant yet. Nation inserted Avon's brother as a potential story hook that might get picked up on in the future, but then either forgot about it, decided it didn't fit Avon's character as it developed, or decided it was more interesting to create the Anna Grant backstory. Story hooks are like fishing hooks (which is probably why they're called that) -- you dangle a bunch of them out there, but only some of them will get a bite.
Blakes 7 has been the name of the show since I was 8 years old. I don't care that it doesn't really make sense it's impossible to imagine it being called anything else.
Sure, but if they'd come up with something better in the first place, you'd be saying that about whatever that title had been. Lots of things we love have weak titles.
Star Trek is a bizarre, clumsy title. Who uses the word "trek," unless they're talking about Boer settlers or mountain bikes? (I find it ironic that
Galaxy Quest would've been a better title for a serious space-exploration drama and
Star Trek would've been a better title for the comedy movie parodying it.)
It is weird that Zen's abilities are never used again (outside of the security system being used in Dawn of the Gods)
Lots of early ideas got ignored later. The ginormous treasure room aboard Zen is largely forgotten after Series A. There's a passing mention of it in "Powerplay" at the start of C, but earlier in "Gambit," Vila and Avon felt it necessary to scam a casino in order to make a tiny fraction of what they were supposed to have aboard the
Liberator already. (Although I guess you could rationalize that they wanted a private stash separate from what Blake had accounted for aboard the ship.)