I think it should give you your primary class ability ...
If you create Cleric ... and since level 2 you will take only Sorcerer levels ... you still should have Cleric ability, bcs that is your primary class (read as: the class you picked when you created your character)
The reason is simple ...
It would give us interesting options of combining different powers, and make multiclassing even more interesting. :3
I still dont understand why cant we change Race for our hirelings.

Lets us play Githyanki as racist as they trully are!