Why would Fe need to take precedence over Ti in an INFJ? Basically, if you're an Ni dominant, there are two options -- Thinking extroverted and Feeling introverted or Thinking introverted and Feeling extroverted. If you're Ti/Fe, you're INFJ, if you're Te/Fi, you're INTJ. No reason they have to be in any specific order in your consciousness. Can you think of one?
Essentially, having a dominant function makes sense. Specific order for the middle two I can't think of a reason for. It also makes sense that the opposite of the dominant would be most difficult to develop, so we can call it inferior.