It is difficult. Where do we draw the line?
With the PBKs it is quite clear, they think that they and the BKs are one family, they uses or recognise the same Murlis and Knowledge, they claim mediumship of the same god or spirits.
The Vishnu Party were news to most, or all, Westerners and there was historically some interest. I think quickly the consensus arose that they had crossed over the line and were pushing some other religion altogether. Some branch of Hinduism. Especially when it turned out Mr Patel was God. No one has clarified whether he is also a medium ...
None of the rest have come forward and said, "Yes to Knowledge, Lekhraj Kirpalani, Murlis etc". They seem to exist as a reaction against and to hate the PBKs! Do the BKs don't want them back?
The BK have never really explained the difference in character of spirit speaking the Sakar Murlis to that of the Avyakt Vanis. Although I am not taking sides, I would say that the character of Virendra Dev Dixit's Clarifications is a lot more like the character of the Sakars.
But, hey ho, what a can of worms to drop on the United Nations Organization doorstep. Reality here we come ... But, remember, we are not here to criticize but support and hold open discussions.