You don't think so, even though Bitcoin has survived for years with the dev being anonymous. You're not making sense.
It doesn't matter who the dev is as long as the code can be viewed and analysed and the dev doesn't have any power. If the coin is premined and the dev owns a large chunk of it while remaining anonymous, it's going to be very hard to gain enough confidence for the coin to become popular. If he doesn't I see no reason not to trust the project.