My new theory after Episode 8. It's the original "biological" species that became the borg. The Borg are a constant amalgamation of all they've assimilated but they were once biological. The "hive" mind was a biological distinctive of the progenitor species.
The "hand-ler head" is a faction that does not want connection with humans and wants vengeance for destroying their "children" (the Borg). What's calling to Jack is a different faction of the same "origin" species that wants purposeful connection and understanding. Thinking the "original" Borg queen not the cybernetic version.
In the end we will have a complete resolution of the Borg arc.
The "hand-ler head" is a faction that does not want connection with humans and wants vengeance for destroying their "children" (the Borg). What's calling to Jack is a different faction of the same "origin" species that wants purposeful connection and understanding. Thinking the "original" Borg queen not the cybernetic version.
In the end we will have a complete resolution of the Borg arc.