Many proponents present the position that, in their view, self should be considered the most fundamental of the seven foundation competencies, since its achievement creates the underlying personal attributes needed for successfully developing the other six competencies.
But this do not demonstrate higher level thinking. Better answers would either
(1) provide additional appropriate justifications for considering the self competency the most fundamental or crucial (e.g., all cognitive and behavioral activity of the individual is ultimately the result of the mental activity dominated by the personal systems related to the self competency), or
(2) provide reasonable and appropriate arguments, with proper clarifying assumptions, for why one or more of the other competencies should be considered more crucial (e.g., individuals with a minimal level of the self competency might be successful in organizations, but weakness in the communication competency would cut them off from the information needed to effectively make decisions and manage self and others--thus arguing that the communication competency should be considered most crucial).
Obviously, effective critical thinking could lead to a variety of other reasonable and appropriate arguments.