I Googled the Nexus and - from what I've been able to make out ... been able to gather
- some novelization(s) made it a Q invention, which they basically got bored with and carelessly discarded. I hate that they went the easy, lazy route, by committing to this storyline. Q this ... Q that ... It's this one hand unbound and you're free thing, for these writers - just use Q!!! This is why I do not really read STAR TREK novels, or at least ... only do so, extremely rarely.