Sunny had dismissed the Marvelous Mimic from the Forgotten Shore while four of his incarnations were inside, and then summoned it to the Eternal City. That was how five of his avatars ended up at the bottom of the Stormsea at the same time.
He called upon the Shadow Legion and summoned the Puppeteer to gain a flawless measure of control over his shades. Mind Weave allowed him to issue countless commands at the same time, so he could control all of his shades individually… but at the end of the day, he was still issuing orders.
With the great Moth controlling the shades like marionettes, though, Sunny could do more. Instead of giving endless commands to make his shades do what he wanted them to, he only needed to command one — and as long as an incarnation of his was wrapped around the Puppeteer, the entire Shadow Legion became no different from an extension of his body.