As I understand it, the good thing of having hip as the root of the hieratchy, and abdomen and hip2 as it's children, is that hip is affected by it's 2 children, all right, but normally only to angles as permitted by the spine, which are not so large. Hip2 can then deal with the deformation imposed by the thighs. There is no difficult seaming at the crotch and butt-crack.

In my porting efforts of V3 dresses to Antonia the difference was not so relevant because the upper end of V3's hip more or less was at the same position as Antonia's hip. The skirt has it's own rigging anyway. 

For trouser-type clothing, everything depends on the JCM's in hip2. If they are not set correctly porting will be a failure.

I did not try to convert G2 clothing yet, but there taking G2's waist as Antonia's hip and the G2 hip as the equivalent of Antonia's hip2 may do the trick.