"Sure," the other two girls got used to how weird he used to behave. As for Karoline, she objected a little, asked many questions, and all got answered that she would find the company of these two girls interesting and amusing by joining him.
As for his friends and team, Sloth and others, they were already busy helping everyone in the city, arranging the newly joined masters and helping city masters to prepare for the upcoming war.
William already sent a work back using Fonda, who was present with the other two girls when he returned home. He already made lots of grenades. But with the current scary size of the normal masters, he knew the dark masters must be preparing their fullest forces as well.
From the simple interaction with these dark masters from before, he knew they were using weird and uncommon ways in the tiny world to fight. And that meant their overall power wasn't just depending on the spirit body advantage they got.