"To be honest, the stakes are too high. If it were me, I would rather let the Fallen Abyss descend for another half a month than take such a risky gamble.”
It was precisely because of the ability to control other creatures of the Fallen Abyss that the Thousand Islands Army could come to the snake without any obstruction and directly fight the final battle. If it weren't for Clark, it might really be like what Louise said, delaying the final battle with the snake for half a month.
But on the other hand, if Water God didn't create her own " shadow of fate ", Flocca would have been able to successfully seal the well of the Abyssal Sea after the Thousand Islands Army defeated the snake.