Standard Poser figures contain a stomach area which may be split into one or two groups, a pelvis area and two legs. The thigh area of the legs may be split into an upper and lower sections or kept as a single group.

Antonia meets this criteria, there are no issues with the grouping or topology.

Antonia's rigging could be the best thing since sliced bread or absolute rubbish, it makes no difference to me. Her rigging in my opinion is in fact very well done indeed.

IK chains similar, will not matter one way or the other.

Consider the Poser 8 figure Alyson

P8 Alyson's upper stomach is named "abdomen"
P8 Alyson's lower stomach is named "waist"
P8 Alyson's pelvis area is named "hip"
P8 Alyson's upper legs are named "rButtock" and "lButtock"

Alyson complies with the standard Poser body part naming convention.

Antonia's, upper stomach is named "abdomen"
Antonia's lower stomach is named "hip"
Antonia's pelvis is named "hip2"
The top of her legs are named "rThigh" and "lThigh"

Alyson's topology is the same as that of Antonia', however whereas Alyson conforms to Poser's naming convention Antonia's does not. The consequences are that there will be issues when the figure is used with existing elements of the Poser application. There will include, but not limited to; Wardrobe Wizard, Poses, other scripts and utilities.

It could have been avoided very simply if the lower stomach area had been named "waist" and the pelvis area had been named "hip"