Hi Sean,
Firstly, Samantha and Patrick are awesome dancers, i love to watch them they have fantastic energy and are full of character.
You should look at post by Hugh1a some time ago entitled "And then there was Paula Abdul..." he asks the on1 vs on2 question, and got some good answers. You will see my opinion there too about styles and music. For me, i feel the style from the music. I wont say any style is better than another, but they are all different.
As for inline looking like it lacks energy, and they guy not moving, well, i suggest you watch some other dancers.
Generally, as inline dancers, the music is less hard hitting, and a little bit slower and in my opinion, so interpreting less inergetic music may result in a calmer output on the dancefloor, and most NY stlye dancers, aspire for a smooth, sleek, effortless looking style, rather than fast and frantic.
Heres one of my favorite dancers, Shaka Brown, note the musical interpretation, and smoothness of his style:
http://www.youtube.com/watch?v=HfFoB2ZAu2g&feature=related
http://www.youtube.com/watch?v=w63eJri7bbM
http://www.youtube.com/watch?v=c1-UpmmMeWo&feature=related
Peace and Love,
Tom