Is the Borg Collective aware of the Q continuum?
The Borg cube near System J-25 in the Delta Quadrant, must have seen the Enterprise disappear in front of them and completely off long range sensors. Could it be possible that that's the main reason why the Borg pursue the Federation -- because they know a life form as advanced as a Q is interested in them, and as such there must be more to them than meets the eye, thus making the Federation more than worthy of assimilation?