Golf ball at rest moved in rough?

I have a query about the golf ball moving a couple of inches in the rough. My playing partners ball landed in the rough on a downslope,

He then approached the ball ready to play it but had not addressed the ball, but had taken his stance, could not really address the ball because of the position it was sitting and the ball would deffinetly have moved if the club was placed at address. When the ball moved it was in a better position.

My query/question is should he have had a penalty stroke for the ball moving and for not replacing the ball from where it moved.

I think he caused the ball to move because of where he was standing and how fragile the ball was sitting. This was talked about in the club house and others where saying because he did not address the ball then there is no penalty.

I was thinking 2 shot penalty for ball moving and for not replacing the ball.