This is not exactly breaking news. Enterprise bought them mid-year 2007.
Enterprise historically has been in a different market than National/Alamo, thusly the different way they charge their rates. They weren’t in the tourist/renting to business travelers market like National/Alamo and Hertz were. I am pretty sure National/Alamo will stay inline with Hertz. Since it is now two years since the purchase, this is how it has pretty much played out.