Obedient to odor really in essence means he recognizes it, and stays at source.
What Salu is doing right now as an alert is quite nice for scent work competition. Eventually adding in nose touches will help with level 3 exteriors and with truffle hunting while still avoiding what we call an active alert which is where the dog interacts more with the target (such as pawing). Being able to have a more precise alert (nose touches are what we recommend) or even staring for hides at elevation are good for competition. The skills you learn here in this class will transfer very easily to the competition ring, while you will be using different odor source.