We may inwardly and privately view the Guru as a Buddha, but with respect to the behavior of their human aspect that lives in human society, if they constantly lie, disrespect their Gurus, act in contradiction to Buddhas teachings and strongly and continuously encourage others to do the same over an extended period of time, this "emanation" is showing the aspect of an invalid Teacher who's actions must be called into question, and if they cannot give a sensible response that accords with the Dharma, or change their actions so as not to be a constant hypocrite, they should not be followed for they will lead us most certainly to the lower realms.