This obviously doesn't pertain to the league at all, but I've been curious about general Zerg strategy in 3v3 pub games against people that don't suck.

Most of the time you see a zerg do some mass macro > mass +1 hydra timing that synergizes with the other allies. What happens when you get double or triple rushed, and you have shit allies that can't or won't help you? Can the mass hydra build hold that or are you basically fucked without aid? It seems like most people I see do it barely make sunks and they just get lucky and never get attacked before they have mass.

Dunno if anyone else heard, but Blizzard confirmed in their most recent Starcraft developer update, that they will be eventually removing the sprite limit that currently exists. For those that don't know, this is the dreaded "cannot create more units" map max bullshit that keeps things like dark swarm from working, or basically building anything.  They didn't announce a date yet, just said it's coming. This isn't usually as much of an issue in 1v1 but it definitely can be in 2's / 3's.