Ironically, if Roddenberry had approved the idea of linking “Time Squared” and “Q Who” in this way, it would have been an echo of the show’s other big Borg reveal. In the Season 1 finale of TNG (“Neutral Ground”), we learn that Federation and Romulan outposts have come under attack by unknown forces.
Maurice Hurley wanted this to set up the introduction of the Borg in season 2. The 1988 writers’ strike delayed these plans, but the Borg’s attack on Jouret IV in “The Best of Both Worlds” belatedly confirmed that the Romulans were behind previous attacks on outposts along the Neutral Zone.