Little video that shows the importance of letting the ball travel. As far as the SS covering 2B on a steal, looks at Kinsler's position at the 1:57 to 2:00 mark. That's what we teach our SS's to do, some coaches like the SS to straddle the bag which is okay too, we just like our girls in front of the bag.
https://www.youtube.com/watch?v=RRcyNwmZ104
https://www.youtube.com/watch?v=RRcyNwmZ104