First: The Boy Scout handbook, Scoutmaster handbook, and Venturing Manual does not state that a Den Chief needs to be at a certain rank to serve that position. However, as the Leadership Training Committee Guide states, The den chief is selected by the Scoutmaster, Varsity Scout Coach, or Venturing Advisor upon request by the Cubmaster, and approved by the Cubmaster and pack committee for recommendation to the den leader.
Second: Packs, Troops, Crews, Ships, Districts and Councils must stop implementing their own rules or defining positions so it better fits their needs. National spends alot of time and effort making the rules so that all can enjoy the program. According to National their has never been a Rank Requirement. This is a Requirement many Packs, Troops and Districts have imposed.
Third: When this type of "Urban Legend" happens only the youth suffer. For instance, 25 boys were seperated during training at a POW-WOW last year because they were not First Class. Trainers start to enforce these false requirements as if they were real.