User blog comment:FireClan/Just A Little Poll/@comment-25630395-20160419000825/@comment-24810042-20160419213815

Onestar's leadership was fought for after Tallstar chose him to be leader over Mudclaw. Mudclaw was angry, so he started a bit of an uprising with Hawkfrost. After Firestar and Brambleclaw helped him, he wanted to prove that WindClan could be alright without ThunderClan's help. Basically, on a scale of one to 10, he became a jerk 9. He isnisted that Firestar never help him out, and just became too bitter.

Hope that clears things up!