Could the rise of the Reform Party in Brooklyn and nearby have been the main cause of Jerry Kassar's sudden and not foreseen resignation as Kings County Conservative Party Chairman ???
If you are Bob Capano, the answer would appear to be an absolute and resounding >>> YES <<<
Up front, let me tell you --- this is a conjecture piece. I have no direct quotes from Bob Capano where he says, "I caused Jerry Kassar to step down as the Conservatives Brooklyn Chairman...."
What I do have is/are several releases since primary day where Bob pointed out that in recent primaries, several candidates supported by him had been victorious, and some were against the people Kassar is/was backing.
Specifically, Bob Capano was very proud of his support of Vicky Paladino in Queens for her victory in a GOP primary: in addition, Bob's "Plan 'A'" stayed "on track," as his local candidate for State Senate against Jerry Kassar's boss, Marty Golden, Andrew Gounardes, came out of his primary with Ross Barkan as one of the few centrist Democrats to beat a more left-leaning opponent; and that in her primary for AG, Nancy Sliwa outperformed in Brooklyn, while winning her spot on the Reform Party's statewide ticket.
Bob Capano would be the first to acknowledge that Kassar had many big problems on his plate that had nothing to do with the Reform Party. However, in 2017 it was, in large part, Kassar's machinations that led to the open split with Capano, and something that led to Capano's sticking with his Reform Party run in 2017. That led to Capano's becoming an enrolled member of the Reform Party and then its Brooklyn Chairman. Then, in 2018, the Kassar-Capano split came to the forefront again when Marty Golden did not get the Reform Party line or their endorsement after negotiations involving Golden and Kassar, and Capano broke down. Eventually, Marty's chief opponent, Andrew Gounardes, got the line and the endorsement, which then boosted his run in the Democratic Party Primary.