How much of Sky is in Reverie?

I was curious how much of Sky is wrapped up or involved in Reverie. Ive recently played all of Crossbell, Cold Steel 1/2/3 (finishing 4) and Daybreak 1. I somewhat remember sc/fc i dont recall much of sky the 3rd pretty much at all outside of Kevins introduction and the two Sisters.

So three questions:

1. Do any plots or important unanswered things finalize in Reverie?
2. How important is Sky the 3rd to Reverie?
3. Would i enjoy it enough for the Crossbell/Cold Steel wrap up to wait for the remakes to replay sky?

Thank you!