It'll be interesting to see what happens, everyone is predicting a Newsom/Villarogsa runoff (which means Villar will be Governor as LA has more votes than SF, and most of SF hates Newsom for not preventing the housing crisis) but it all depends on turnout. With mail-in ballots by default, a huge amount of Democrats might vote or a huge amount of previously untapped Republicans might vote. A major factor here is that there are eight Democrats on the ticket, all of which have their own cults of support. Meanwhile the CA GOP is rallying around Cox with Allen as a potential spoiler.
In other words: it's a fucking mess and it's exactly why Brown was against the top-two system when it was passed four years ago.
(Also don't defend the CA GOP ever, every single CA GOP Governor has passed gun control with Arnold going so far to ban all .50 cal weapons and most handguns, building off the handgun safety act Wilson passed. At their recent convention they couldn't even give Cox their official endorsement because he only had 55% of the delegates and not the minimum 60%. The party is fucking garbage and you are all seriously better off writing in Little or voting Green).