Why do we need to judge him? He did a lot of great things. I don’t know why he did the “odd” things he did, but I do plenty of my own sins to account for, why dhoul I meddle with some one elses. Appreciate him for all the great things he did. v’amech kulam tzadikim. I personally knew him, from a distance that is, and a lof of people he was mekarev,who are mainstream litvish people, who you would not think were once hippies. He has many zechusim.
In terms of mimkomcha, the story I heard, possibly from SC himself or from one of his students (It was a long time ago and the story is fuzzy so don’t take it as 100%) was when SC sang it for the Amshnav Rebbe zt”l (I think) the Rebbe said that this tune is nusach from the beis Hamikdash.