It is and should be in, but they are both suppose to equal in power and effect.
It just feels right, and I do think they did it perfectly with Asrai, so yeah it is a nice have, because now I can use Naestra and Arahan or is it Arahan and Naestra?
+rep for best reference evar!
But yeah something like that, it should mean nothing but makes it worth every cent.
But don't get me started with CA not making mixed Gender unit or Male Spellsinger -.-'