Re: Riley Frazier
I just figured that the drones beamed over to some of the ships at Wolf 359, assimilated the crew on those ships and then flew the assimilated ships to the DQ. In my novelization of tBoBW (link in signature), I mention that they detect some Federation engine signatures heading away from Earth.
And it makes perfect sense, too! Federation technology was still new to the Borg at the time of "The Best of Both Worlds," so they'd have wanted ships to take back to the Collective.
"He clapped his captain—his friend—on the shoulder. Yes, this man was very much like James Kirk, in all the ways that mattered." --Christopher L. Bennett-- Star Trek: Mere Anarachy, The Darkness Drops Again