A: I don't think it is. Kikyo was overpowered by the miasma and someone had to purify her, preferably a miko with such powers. Kagome was the only living miko who had a power so strong that it could purify Kikyo. However, she had grown jealous of Kikyo, due to her relationship with Inuyasha. Her mind could go both way - she could save her or leave her like that.