I was just commenting on why everything looks Gascan now as well but I'm not sure you were following. As you say, it comes down to design, not base curve or unob or lack of unob and so on. In the past the styles were broken into families. Jacket family, Frogskin Family, Wires, X-Metal, Zeros, M-frames and eventually new categories like the Over The Top family for funkier styles.
Now when you search for styles the family system is gone and styles are categorized (online for example) by frame material now. There are no more families for organizational purposes. But the Gascan has created such a distinct style that it has brought upon a new family for styles based on it as styles in teh past had to crea the old system. I actually got this from a new product tech sheet.
So the Gascan, Thump 2, Oil Drum, ORokr, Canteen are all part of this new family. The way the family sytem had worked then with the Eye Jacket (EJ > TrenchC > SJ > TopC > RJ > Minute >>>) and the Frogskin (Frog1 > Frog2 > Five > X > XX > Four > Five2 > MD >>>) spawing their own long running families over the last 8-10 years.