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It makes sense to me that the "I-function" box dictates the other boxes in one's nervous system.  "I" am the focus of my actions, my actions are focused around me.  Other people's perceptions of my personality is based on a series of actions that "I" am responsible for.  If the other boxes were not rooted from the "I-function" box, then the output would be a product of one's own surroundings.  On the other hand, since a person's actions are based on their unique"I-function", then no one's actions are going to be exactly the same in response to the same stimuli.  This means because of our "I-function" we are independent of our environment because we act more in response to our thoughts, than we do to our surroundings.