shlishi –
“How can that be if both Rebbes oppose the eruv?”
Because Rav Aharon was not originally opposed to an eruv. Once the Zalonim made it an issue of frumkite then the Aharonim followed. This is demonstrated by the fact that many Aharonim carry in Boro Park, but not openly in Williamsburg.
What record? Please cite one of his writings.
They had an agenda, and did not stop at anything.
No. I mean that they have a rav but not a particular rebbe. Yes do the math. There are approximately 20,000 families in BP. How many belong to the major Chassidisim?