I've just watched Dark Frontier and wondered why no attempt was made to liberate Magnus Hansen, who was present when 7 and Janeway were rescued. He is the father of 7. Would she have left the parent of any other crew member behind? 7 was obviously affected by seeing him and although Janeway wasn't present for the reunion, I'm sure that she was made aware of him being with the Borg Queen, once back on the delta flyer. Considering the lengths she went to to help others, it seems bizarre that he was left behind. After all, if you can help one drone leave the collective, you can help a second.