Muska again

770 bochur comments to the name of the Lubavitcher Rebbetzin:

I understand that this post does not fit the general politik of the site, but I will go ahead anyway. With all due respect, the Rebbe referred to the late Rebbetzin many times over using a shin (in speech, there is little room to go wrong there). I would venture to guess that the Rebbe would have some rudimentary knowledge of all the abovementioned.

After all, the first instance of shin and sin getting mixed up goes way farther back than litvishe yiddish. (In fact, it's in the Bible (Shoftim 12:6), where is was used by Gilead in a civil war against shevet Efraim.) So barring total incompetence of a kind that the worst anti-semites do not accord the Rebbe (or the theories on the Lubavitch left that the Rebbe went overboard in '88 already, G-d forbid), this must weigh in on the debate in some way. Am I going wrong somewhere?