I agree that this is true 90% of times but if you included office politics in the equation sometimes it is not.

If it is in a deep political institution these are the initial set of questions I would start with:

Who is the Jr to the the VP, what are their relation ? How is your Jr to the manager ? How is the manager relation to the VP? How respectful to boundaries the VP is to the boundaries? How likely is for him to repeat or to get you shoved out the way next time ? How much do you care about being put astray in comparison to the quality of overall work ? How many times this has occurred before ? How likely is for the Jr to bypass you anyway ?

And as one can see, this is just too much to bother with. Sometimes it is easier to cry out that you need more money and or time.

I would do the same by the way. Make the distraction go away and try to put things back into the process route. If the process does not work and this is constant there is no reason to tell the person that pays you that they are always wrong.