In fact, during the Edo Period, it was the Kanze Sect that first set up a branch (Bunke). Afterwards, based upon this exceptional case, other heads of the school also followed.
これは江戸期に観世家に限り分家(現在の観世銕之亟家）を立て、これをほかの家元並みに扱うという特例が認められたことに基づくものである。