No, but Ples could definitely be a mana unit, that's true. Anyway, Volfy is ready to execute Ples, the newbie, and Plesen. The first one because she's white, the other two because of their gray color. The question is, which one of them is actually gray. And yes, the gray one needs to be executed urgently, because otherwise, if Arandor ends up with only Ples and the newbie, and has to guess, it will be a bit sad. Although, if the gray one found the game interesting, then maybe it's fair. But that's only if the gray one isn't Revan.