Not sure if this counts but if the national environment has been a tiny bit better for Democrats a number of Republican decisions could have been the difference – they could have nuked KY-03, MO-05, IN-01, one of the NH seats, maybe even GA-07 and/or FL-23. Might have run into issues with the courts in KY and MO but still.
Kentucky has some pretty strict laws on redistricting that would make getting rid of KY-03 basically impossible, and some internal political realities that would make changing the law almost as impossible.
Yes, the KY rules/judicial traditions are on par with Fair Districts Florida. KY-03 fits within one county, so it has to stay there, and there isn't anything R enough anywhere in Jefferson to make it interesting.