Aldebaran... [spoiler discussion]

Aldebaran clearly has an authority, the question is, authority of pride or the authority of envy? He showed a visceral reaction to satellas shadow when she appeared in arc 7, but we've known pretty much since the beginning of the story that the Pride position has been open in the WC. As far as we know, Satella is the only one capable of bringing people from Earth. However, Al Shamak is an interdimensional spell, so maybe you just need strong magic. If Aldebaran has the authority of envy, why? Satella supposedly loves subaru, and loved flugel. I don't think Aldebaran is Subaru, the nature of their powers are different yet they do have a connection. I think he has the authority of pride, but I can't think of anything to back that. Thoughts?