I'm from the opposite coast, so therefore know very little about NYC politics and less of NY State politics, but I'm wondering if the Dem Party establishment will even help Zephyr Teachout in the general election. The Dem Party has been known to sabotage the more progressive candidate in the primary, so that in the general election the voters go ahead and vote for the Republican candidate instead of the DINO the Dem Party supports. Of course either way the voters go in the General Election the Dem Party can be sure an establishment candidate will win so it's still a "win" for the Dem Party.
Zephyr Teachout has upended things by winning in the primary, but the Dem party can withhold money, voter lists etc. She may well have to rely on support from outside the Dem party, not at all a bad thing, Bernie showed us it could be done! The other concern is that the Dem party will try to sabotage Zephyr because they'd rather have the Republican. I looked up John Faso briefly on Wikipedia. He will be Zephyr's opponent in the General Election and he has supported charter schools and is currently being backed by two hedge fund guys. Sounds like someone the Democratic Party establishment would love.