Doesn’t the success of an agile change within an organisation depend essentially on the external consultant (or the boss) who introduces or implements it?

This is indeed one of the recurring dangers that we have often had to deal with in the context of “liberated companies”. For Clarity, our objective is for you to become very quickly independent in the day-to-day management of this change. For this very purpose, we train and supervise an internal team responsible for continuing the steering process. Furthermore, Holacracy is perfectly in line with this vision since the external consultant disappears in favour of the governance mechanisms resulting from this method.