I mean that SubscriberStar mentions that the zombie bosses, that are teachers in Reload, would be added in the upcoming updates, and that in this game they appear in the win animations of Esther. My question is about when they will be released.
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I'm not a developer. But I'll risk guessing that such things will be done after all the characters are released. It will just be more convenient for development. But of course I could be wrong :) Otherwise you'll have to dig into the code again and again after adding characters. And when everything is there, it's a much less labor-intensive process.