It's the multi-purpose story, where the characters are pursuing different things
Five characters are gallivanting around, and the best you can say is that three of them are traveling together and so I have only to keep track of three sets, and the worst is that a fourth set is sitting around waiting, and worse, waiting for a child to be born, thus giving a flat deadline for certain actions by the others.
And that's just the heroes. I had omitted a villainess from a scene where she would certainly have appeared because she's not dead yet.
I probably have to put in a scene where she plots the attack where she does die. Meanwhile, three other villains are also plotting their schemes, and they all thoroughly mistrust each other by now.
I had written flow diagrams in the outline stage to get this all in order. And it is true I would hate to see how bad it would be without that.