The importer is (or used to be) responsible for the vertex reordering, for which the fix was to use a different (but older) import script (may still be possible if Python module changes haven't broken it).

When you import an OBJ, you should get one mesh for each group in the file (open an "Outliner" window makes it easy to check).
If you not seeing meshes named correctly (or your getting just one) check the Poser export options (you need just "Include existing groups").