It's been what, 27 years since First Contact rewrote the rules on the Borg? You can't dismiss something that transpired on-screen--such as the Borg Queen verbally commanding drones--as non-canon. The Borg Queen is portrayed as an individual with her own personality and desires in all of her appearances, including Picard. In Picard, she even makes an explicit reference to having an army follow her. The Borg haven't canonically functioned the way you describe for almost 30 years. They're a hive mind, but they do have a hierarchy.
So yes, Seven of Nine being tertiary adjunct of Unimatrix 01 means she was an important drone, and the Queen went so far as to call her a "favorite."
100% agree with you, and I'm sorry you have to argue with a fanfic writer over a concept which is plainly obvious in all the episodes we have seen over the years.
My impression is that "collective consciousness" is like a very tightly-knit family with a collective will (directed by the BQ) -- "individual will" is taken away, but as in a family, each member brings their own "biological and technological distinctiveness", implying there is still a hierarchy... different drones with different specialties- tactical, medical, chamber maintenance, tertiary adjuncts, etc, but they all act collectively as one big happy united Borg family. "species 10026 - you can feel their distinctiveness coursing through us, enhancing us". Collective to BQ: "Voyager has altered course, current position spatial grid 632" Janeway: "I don't know how you do it, all those voices talking at once, you must get terrible headaches".
- the Borg can hear everyone else's thoughts. whenever we "hear" the voices of the Borg collective, the sound effect is a whole bunch of whispers of many many *different* voices / thoughts. this susurration implies that drones are thinking many different things, likely due to different daily experiences each drone may have. This is obviously chaotic, but before the BQ brings order to that chaos, and of course each ship has a vinculum to purge any extraneous thoughts and prevent infighting within the collective.
- the 3 drones whose parietal lobes were connected by Seven after being marooned -- they were "individuals" but part of a micro collective. they (like the larger collective) needed "consensus" to be able to proceed with anything. Imagine trillions of drones connected like this? Still individual voices, but none have the will or ability do to anything on their own.
- lack of individual will leads to lack of innovation. this is why the Borg couldn't "think of" a way to engineer nanoprobes to defeat species 8472. however, in Unimatrix Zero, the BQ (as the leader) actually innovates and directs the strategy ("bring me his cortical array", isolating/amplifying interlink frequencies, relishing disembodiment of her wayward drones, etc)
with that said, I assume there is redundancy, and it is possibly to "become" a queen in case of need or emergency or if there is no collective set up (like Seven when she reactivated the Artifact's drones).
I think Agnes's experience with (as?) the BQ over the next few episodes will be really helpful in telling us more about how things work in the collective![/QUOTE]