Re: FC plothole? Why didn't the Borg create the vortex in the Delta Q?
Maybe the Borg figured that if they created the wormhole back in the DQ, then spent all that time in the past on their way to Earth, they might accidentally change history in an unpredictable manner - a 'blowback' that might come back to hurt them. Much easier to save the time travel for the last minute, makes it less likely that they'll change something they don't want to.
"If the world was perfect, it wouldn't be." - Yogi Berra