[Bigwill]

I was working on getting my swing on plane recently, and it seemed that I needed to go a little higher with my arms than I had been recently (I had gotten them too flat). As a matter of fact, an on plane swing feels like my arms are just lifting straight up right off of the ball. My conclusion was that, since I have a big shoulder turn (I've even worked on decreasing it a bit recently), any feeling of "in" with the arms would put me under plane. So:

1. The pivot is responsible for the "in", and
2. The arms are responsible for the "up "

Are these accurate statements? If so, would it be accurate to also assume that the amount of "up" you should feel is directly related to how much "in" your pivot creates?