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I feel like it's wrong to assume all four of those designs are actually going to debut. When it comes to these premade characters that you can select during audition, there's always the chance one (or more) of then don't come out.
Case in point, here's an audition opening from 2019. Of all these characters, only one has ever debutted...and it was a couple months ago. So don't be surprised if wave 3 end being only three people and/ or it gets postponed and we end up with different designs altogether.