King Ghidorah and MUTOs

well there not really electrical bolts, there gravity beams last i heard

They are Gravity Beams. So I think it wouldn't matter to King Ghidorah if the MUTOs were extinct or not. Besides, he has his strength and 3 constricting necks. He doesn't necessarliy need his Gravity Beams to fight.

Even thougth they are not electric beams, having the MUTOS einctxt afect the ecosistem would be a good idea, i mean serisawa whas wrong, by killing both MUTOS godzilla didn't creat balance he destroyed it, scince MUTOS controll the Godzilla population and vice versa

pretty sure theres only one godzilla and if there isnt theres probably just a baby or the egg that will become a baby. having more than two godzillas at a time kind of takes the magic out of him. the only reason the baby wouldnt is because godzilla will need a replacement in some point when he most likely dies of old age

Perhaps because there are different types of mutos (Godzilla, Mothra, KG, MUTO), they will give a nod to an old Goji foe in the sequel and call the first films MUTOs Gigan or Megalon? Just for their record books?

Yep. Maybe the muto prime could stalemate it but it's not canon i think