Lets say you're unsure about something about how the dojo is run or about the art that you're learning, it makes sense to ask an instructor but what I don't get is why wouldn't you ask the main instructor in charge of the dojo? Provided you have contact with the main instructor. Depending on the dojo and the situation you might not have regular contact with the main instructor, but if you do, if the main instructor is there on a regular basis why would you avoid asking him and instead ask one of the assistant instructors?
Now in the past I've brought this up in regard to asking about belts and rank advancement but this can apply to anything. Anything you're unsure about. Not necessarily stuff about belts and rank advancement although it can include that but if you don't understand something about how a technique is done or about any of the procedures of the dojo, there is nothing wrong with asking the chief instructor the way I see it. Some people might not think there is a need to ask the chief instructor but why would you deliberately avoid him? Sure, you can ask an assistant instructor but why would you go out of your way to not ask the chief instructor if he's there?
Now in the past I've brought this up in regard to asking about belts and rank advancement but this can apply to anything. Anything you're unsure about. Not necessarily stuff about belts and rank advancement although it can include that but if you don't understand something about how a technique is done or about any of the procedures of the dojo, there is nothing wrong with asking the chief instructor the way I see it. Some people might not think there is a need to ask the chief instructor but why would you deliberately avoid him? Sure, you can ask an assistant instructor but why would you go out of your way to not ask the chief instructor if he's there?