Granted that the VOY Queen was the likeness of Susanna Thompson, not Alice Krige. But then she AGAIN became Alice Krige for the final episode. Apparently, she really is mostly software, capable of escaping physical doom by retreating to the Collective as a lump of data, and can take on one of these "standard bodies" of Species 125 type whenever she feels like having
There were some differences between the Susanna Thompson Queen and the two Alice Krige ones, and I think that a case can be made for these being three separate beings.
The raw material in the form of female drones is already in place for making Queens, and I think that there were thousands of potential Queens at any given time, drones that had extra special programming as in "royal jelly." So long as the central processer is intact, a new Queen can be chosen if something happens to the old one.
I believe there was only one Queen at a time, she is the one who speaks, and she has a certain amount of individuality. One hive mind = one voice, anything else would be redundant, confusing to that one hive mind and would set up a lot of inner conflict within the Borg.
There is a Queen that controls the Borg and a mechanical central processor that controls the Queen. When you disrupt that Central Processor (which is what I believe happened in "Endgame") you disconnect all the drones and we have good evidence that disconnected drones regain their individuality and do so almost at once.
That leads us back to the first question "Who were the Drones in Unity?" They were interesting in that it could be looked at as a scenario on how the Borg came to be in the first place.
Freed individual drones, a lot of infighting and discord and the leaders of that group decide that they will form a "Cooperative" and all the former drones are involuntarily reconnected. That is power and just how long will it take for someone to desire the power to order this new society because that person "Knows what is the right way to go,” to use that power to reform their Cooperative into a Collective.
They are just one step away from being a new Collective. This is where I believe Trek Lit has missed its mark. That is the former Borg Collective has been reduced to individuals, some of which are not above using existing Borg technology to reform into Cooperatives that evolve into Collectives and the whole thing starts again only this time they will have to fight each other too.
Ok you guys are doing it to me again, you are going to make me write fic and I don't have time. I'm doing NaNoWriMo starting tomorrow with original characters, space ships and a newly discovered Jump Gate orbiting Jupiter.
So many stories, so little time.
Brit
Edited to add, ok natural progression here. The Borg had some idea (and I think a misguided one) that only females could be "The One Who Speaks". I personally think that had to do with the Borg idea of perfection and the way female chromosomes line up. Other evolving Collectives may not have that particular hang up, so we could see Borg Kings too.