@ Grass my solution doesn’t assume anything. Nothing is perfect in this world but it is a very good metric. It is much better than for example, assuming you and I will “figure it out”.
Keraveltheint no I disagree. My creteria says if all or virtually all gedolim say the the rebbe of X went off. Than everyone including and especially his chasidim should abandon him. This would be very different than if they said he is a leader Torah authority and qualified to pasken, but I disagree on this particular issue. Same by a posek, if leaders say a certain posek is qualified to pasken aguna questions, but learned wrong pshat in this case, that is very different than saying he is qualified to only teach elementary school Halacha. Once again if you have a different criteria for how to establish if (one again very unusual but possible) a particular gadol goes off I would love to hear it.