In turn, 4_InnerMouth is first in the CR2 because that material is the first one defined in the V4 geometry file.

Similar questions have been asked before, and the only sure way seems to be to re-order the usemtl blocks in the OBJ file*. Just editing the CR2 seems not to be enough.

I believe human foetuses develop an anus first, then the remainder of the digestive tract (anyone who's had babies can verify this!) - maybe this means that V4's mouth was the first part that DAZ modelled? You'd think they'd start with the boobs, or something important like that. ;)

*Not a job for the casual hacker...

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So, you see, not a dumb question at all; rather, a deep and insightful question that probes to the very heart of how Poser interprets 3D data!