>>280901807
In No Stella No Life, Echidna has been pretty clear that the person she hates and wants Aldebaran to get rid of is Satella/WoE, and Aldebaran's inner monologue indicates the same.
We are still missing one or two parts of No Stella No Life, but right now Echidna hasn't said anything about Subaru besides teasing Aldebaran about not being the real deal