King Kaiju?

Who are the Kaiju and who is controlling them? i.e if they are being controlled at all? i mean are they randomly attacking just because the portal opened or there is a plan and if theres a plan then how are they communicating and are they making coordinated attacks? So if they are coordinated then there is definitely something which is controlling them which brings in my theory of a KING KAIJU or a QUEEN maybe who is controlling them like the QUEEN from the Alien franchise. What if the King Kaiju comes out at the end of the film and he is the biggest n baddest of them all... WOW gives me goosebumps jus thinking bt it...