Well I didnt think that.At least in the part that she isnt strong. In Heart eyes, Shiva is the true "Heart" of the group. She is someone who stop Ven and Nathan to fly over each other thoats, and hold the group together. And when Heart was having grudge against Nathan, she and Ventus help him to undestand a little about Nathan. Perhaps she isnt strong in physical strengh, but she is strong in both heart and spirit. She is strong because she do not hide her emotions to herself. To me and Heart, Shiva is the stronger member of the team. And I think Nathan and Vetus believe that too.
Kogeki currently ability to active in battles: Anticipation.
