The situation where 5 dragon disasters act independly at the same time is unheard of...
MA is an exception. They had gathered a lot of dragon levels. But, they had a goal when they did it. They let dragon levels to rescuit potential monster to join. Even so, they only used 2 dragons, EC and Goketsu, to the scene.
That is why Black Sperm was surprised by how many dragon level on the scene.
These 5 dragon levels seem go rampage whatever they like.
I wonder if they have some sort of goal or.. they just happen to be here, or lead to.
With Machince God being here again, it's most likely, they release all the monsters to lure other S-class away and force King to fight to gather his data. Since they never get anything out of him.
It would be funny if they already have all data on all s-class heroes. But, they never act, because they never have King's data to analysis and handle him.
King have been saving the world all this time.