To address the point brought up about the rebbe saying about himself that he was moshiach, show me in a sicha or maamer where he says that and not what a mishechist says as they tend to like twisting things to fit to their ideology. That goes for the definitions of non yechiniks too.
Toi: look at the sichos from hey teves and then try saying what you did. Typical? Maybe but all the rebbes in lubavitch vehemently opposed out and out fighting and machlokes. This goes back as far as the first lubavitcher rebbe, the baal hatanya, and I believe it was the Groh ZYA. Chabad.org in my opinion runs with the theory of everybody is a lubavitcher yechinik they just don’t know it yet. It is not run or filtered by the rabonim. Therefore I would not use them as an information source for these things. See? Don’t argue and jump without knowing all areas. You are dead scared what could be legit and who is a bunch of crazies? Even according to the rambam who says that it is possible for moshiach to be someone in the generation who passed, it is a shver tzad and I believe a daas yochid. If you are referring to the yechiniks then I agree they are primarily just a bunch of crazies though there are those that may say yechi but don’t go spouting nonsense all day but instead are actually quite informative in legitimate matters and know what they are talking about.
Itche: 1. It is very possible there where those in his time who felt the frierdikker rebbe was moshiach but it was with a proper and soundly based mind. When he passed, these people realized (albeit with great disappointment (who wouldn’t be?) That he wasn’t moshiach and moved on. 2. Since when was there even a court case? I never heard of it but even say there was (which it is possible knowing some of the er fierce activists), the tzfatim aren’t an organized group that you can say they aren’t allowed in 770 as there is no leader of the tzfatim who tells them what to do (they obviously don’t follow the rabbanim). Either way I don’t see how something like this can be brought to beis din much less a secular court. On what legal grounds are you kicking the tzfatim out (not that I would mind though I would much rather they be willing to actually listen properly to logic instead of blindly following an ideology. Though it isn’t really my place to bash them as I don’t know enough to hold my own against the truly knowledgeable ones and chazal say dah mah shetashuv l’apikores not to actually say it as it is more for your own good to know that you could refute them)