There's always been a spokesperson for the Borg. The closest we ever get to not having one is Q-Who, but even then we have Guinan, and especially Q to speak for them. He's literally standing over Picard's shoulder at every moment explaining or hinting at what's going on.
In BOBW, it's Picard
In iBorg, it's Hugh
In Descent, there's that guy who manipulates Data, then there's Lore, and on the sidelines Hugh
In Scorpion, it's Seven
And in FC, Dark Frontier, Unimatrix, and Endgame it's the Queen
In..wait, there is one episode where the Borg have no spokesperson, or anyone else to communicate their intents and motives. It's Enterprise's "Regeneration," and the only reason that episode works so well is because the crew have never seen or heard of the Borg and have no idea what to do about them, so they were able to sort of pull off a second "Q-Who."