qwerty: 1) Which grandson? Tendler, who was kicked out of the RCA? Regardless, no grandson speaks for their grandfather, especially posthumously
2) a) Rav Miller zt’l certainly was a Godol and b) no other Gedolim disagreed with Rav Miller. Indeed, the Gedolei Yisroel were opposed to Mr. Kahane and his militancy.
3) None of the Gedolim have described Pittsburgh as Al Kiddush Hashem.