Rinpoche has students from all over, and I really don't know how many he has. I suspect only he knows that.
I appreciate and respect you needing answers to your questions, and they are valid questions. I find 'propaganda' and 'dissenting voices' rather strange terminology, though.
Regarding DJKR's attempts to modernise and adapt his presentation to a modern audience, yes, he has a certain 'iconoclastic' style. I have no doubt that has somewhere, sometime upset someone. He might be popular and charasmatic, but he is no 'people pleaser'.
However, when it actually comes to the core teachings he is very traditional, I would say, from my experience.
His teachings are adapted in delivery, but certainly not watered down.
A case in point would be that he gave teachings recently in LA on karma, called 'The Chicken and the Egg'. It was a teaching presented in an untraditional way. But during the teaching he made quite clear his discomfort with 'modern' Buddhists rejecting or shying away from topics such as rebirth and karma.
So yes, there is adaptation in presentation but no compromise in meaning. It is this ability of his to deliver complete teachings in his own style that leaves me in no doubt that he manifests in some way Manjushri's wisdom. But that is not the sort of sycophancy you (nor he) wants to hear
Good luck with your search. I do feel that regardless of what ever info you do find, positive or negative, the bottom line is the only thing that matters is what his teachings mean to you. You are the only one who can be effected by this, not Rinpoche, not his students, not the Dharma, only you....so I hope your search to find critical information is beneficial to you.