User blog comment:M Bierhoff/Why is Avagraine in leauge with Morgana?/@comment-4560619-20111107140821

Wow, did you see the expression on Agravaine's face when he saw that Morgana was badly hurt? He actually CARES about her! If he ends up nursing her back to health, that changes everything. She would actually owe him.

Agravaine would have no claim to the throne if he was Ygraine's brother. He'd only have a claim to the throne if he was Uther's brother. As Ygraine's brother, he could easily want to see Arthur, the child that cost his sister her life, be killed.