Murata already draws incredibly fast considering the quality of his art.
I’ve got a couple of ideas about the Monster King, Lord Orochi. Although he looks like a big, bad dude, he might not be all that strong at all. My first theory is that he is the Monster Association’s equivalent to King, where everyone thinks that he is the strongest but is really a wimp. My second theory is that he is the source of monster cells. In that case, he is the Monster King because he is the one who can produce more monsters.
I’m also going to guess that Gouketsu is actually Suiryu’s master, but gave himself over to the Monster Association like Haragiri did.