So its "Hip2" for no other reason than that was the name that got typed in?

The grouping, hierarchy and IK chains are absolutely not an issue. Just the names.

There is a standard naming convention for a reason. Naming a body part "Hip2" does not magically circumvent rigging issues or make it superior.

Irrespective of Wardrobe Wizard, I don't believe that any existing pose file for what might be termed "standard" figures includes data for a body part named "Hip2". Those files will be trying to apply their hip data to a mid section of the torso which is clearly not the hip.

May I please ask:

(a) how is this incompatibility in some way superior?

and (b)  how is this being addressed?

Edited for clarification 1:48 Eastern