I'm in full agreement with most all the reviewers and their timeline assessments of the episode. The only problem with all of it is when you get to The Next Generation when Q introduced The Enterprise to the Borg. Q and Guinan were both in the bar when Q sent The Enterprise to met with the Borg. They aren't as affected by timeline anomalies as normal humans are. Guinan seems to be unaware of any prior meetings or occurrences involving the Borg, as is Q. Could be an unimportant fact for Q, but for Guinan, if there had been any hint of difference, she'd have said something even if vaguely to Picard. She did so on "Yesterday's Enterprise" as it involved what should have been an improbable Tasha Yar, dead in the main timeline but fully alive for some time crossing that timeline back into the prime timeline, all without Guinan not knowing Yar to begin with. So, this was totally overlooked or a unique plot perspective that could have been tied later on in Star Trek could have been added to make additional intrigue. All being said, this episode wouldn't be directly affected but down the line it could have been put into effect for an enhanced story and adding more dimension to the Borg and where they fit in the Star Trek lore.
Review of Regeneration
