Anyhow back to toi, you have a different question than Joseph : his is how today’s lubavitchers maintain hiskashrus, yours is about the role of tzaddikim in general.
Just a note of caution: I don’t think it’s OK, smart or acceptable to talk about a Gadol BYisrael, Nassi hador whatever term your want to use, as if you’re greater than him when your are nowhere close. Kal vchomer to condescend. That’s in general. If you don’t understand something you can ask to clarify respectfully as we’re all meant to treat Daas Torah.
Not to mention that in your post you are clueless, as the way you understand the Rebbe’s words is completely skewed. Similar maybe, to a goy who sees Jews call themselves the chosen nation, and therefore concludes we must want to treat all goyim like the Nazis did. Completely off. That’s fine because you haven’t learned pnimius HaTorah so it makes sense you can be clueless in those areas, and I’m happy to fill you in but your post was really phrased inappropriately.
Anyhow, I’m happy to address as long as the mods don’t mind as stated. If they’d rather keep the topics to less deep and pareve stuff like the price of fruit on tu bshvat, doctor advice, and tourist destinations, that is their right, but it means I can’t answer on this forum.
So if you are curious, I guess try opening a thread on the topic.