You obviously completely misread my post.
Where do I claim that Posette-V3 contains V3 geometry ?

She can use V3 maps, and THAT ALREADY makes her a derivative work according to the DAZ' EULA.
Plain and simple.

So, as she already IS a derivate work of V3, it would be stupid to NOT include V3's grouping also.

Because a Posette-V3 that can only use V3's textures but not V3's MAT's isn't "more legal" than a Posette-V3 that can use both.

As long as she is properly encoded, DAZ doesn't mind which parts from V3 you "borrow".

But you must understand that her mapping and grouping and joints  and morphs and general shape are equally protected "parts" of V3 and not just  the "raw" geometry.

That's at least what the V3 EULA says.