* Jay, as you can see in the previous post, Sweeney, like Heinsohn and Ginenthal, is likely largely all mixed up.
My own two-cents worth.....
This one is like the KFC ad where the old Colonel says that KFC just does the one thing (chicken) and gets powerful good at it.
Heinsohn, Sweeney, Ginenthal and a few others represent the other branch of the family of neo-catastrophists. As opposed to the Kronia/Thunderbolts crowd, they have largely stuck with the one thing, i.e. chronologies, and have gotten very good at it. In my estimation it is the Thunderbolts/Kronia crowd which is a bit mixed up in this area.
The one other thing which Heinsohn is noted for is his "youth bulge" theory which predicts political unrest with near 100% accuracy, which is why Dr. Heinsohn is a frequent speaker at NATO gatherings.
For that matter, a number of years back, a group of European archaeologists set out to bury Heinsohn and his theories regarding ancient Persia and all they needed to do was produce one stratigraphic layer which Heinsohn's interpretation predicted would not exist and theirs predicted would, and guess what??