Hi Golden Child,
Yes, you have it mapped correctly, provided that the disk image is really in ProDOS ordering, of course. It's really physical order rather than DOS order, though.
DOS ordering is 0, 13, 11, 9, 7, 5, 3, 1, 14, 12, 10, 8, 6, 4, 2, 15.
The problem that we have is .dsk and .po aren't fixed in their format, so we might have DOS-ordered sectors in .po files, ProDOS-ordered sectors in .dsk files, physical ordering in both, etc.
Emulators tend to have heuristics to detect what's what, but as you might have seen with the latest release of Anti-M for the Apple II, MAME failed to boot it because the file format was wrong and the heuristic was defeated.