From the rules (I've bolded the part that answers your question):
Place only 2 master builders for each player into the bag. Place the third master builder for each player beside the new board near the master builder track.
- If you are the first player to place your master builder onto the board (not passing, but placing your master builder on a board field), place you third master builder on the "6" space of the master builder track (for a 6 player game). The next player to place his first master builder places is piece on the "5" space (or, for a 5-player game, place here first) and so on.
So, your assumption is correct.