Different speakers have different views and they are liked by different listeners. It is only natural in a diverse creation, and it is no monopoly on speaking about anything or prohibition to listen.
But as far as the Integral Yoga is concerned I don’t think that someone who is not a practitioner of this yoga, nor a disciple of Sri Aurobindo or hasn’t even seriously studied his major works has a moral right to speak authoritatively on the Integral Yoga, however good and well-meaning his presentation may be.
A speaker may have the art of speaking, may even be a great intellectual but that does not necessarily make him an authority on subjects that are outside the scope of his training and experience. This is not a hard rule, but as a matter of recommendation it is best to the learn from original writings of the teachers or their interpretations by the disciples.
