didint they learn from the Jag days with rivets and adhesive ( bonded on a molecular level if I recall correctly )
I'm sure they learned a lot from Jag, but it looks like Jag's peak sales in the US since '02 was less than 62,000 units in '02.
Ford sold nearly 66,000 F-Series trucks in February alone.
As I recall, a lot of the problem was that it is much slower to form aluminum body panels than it is to form steel body panels, and increasing the speed of productions of the panels was one of Ford's advances for the F150. It doesn't matter if you know how to tie aluminum panels to the truck if you can't do it fast enough to keep the assembly line rolling.