Spoiler (highlight to view)
Okay, so i've been reading, and the whole suspense of whether or not the future of kaoru's betrayal comes to pass...but wouldn't it make sense that feather is actually kaoru from the future who was sent into the past to change history? that would make sense the power levels beyond 7, the similar appearance, and why she can change the future (because it's hers!)
Love, isn't a straight cleared out path. It's one with thorns, and perils that life puts in to shape ourselves to be worthy of that person we fall in love with. You just gotta keep walking.