I'm curious as to why you think he is not soft. My expectations for Power are fairly low when it comes to physical play, but he almost looks like he is allergic to touching other players.
To be clear, I don't expect Power to run guys through the boards. But to be an even marginal defenseman in the NHL, you have to clear forwards from the front of the net, and use your body to position opponents off along the boards or in the slot (e.g. Tallinder or Smehlik). Power struggles mightily with this, and has been caught numerous times "reaching" and being solely focused on the puck, when he should be playing the body. What have you seen that would refute this? And I'm asking this respectfully, because maybe I'm just missing something. I admittedly come from a different age of hockey, where if you didn't play the body as a defenseman, it was heresy. But I would even think in this modern age, you would still have to make some attempt, no?
I understand that this could all change, and this part of his game could develop, but ignoring this aspect of his current play would be unwise and could indicate a shortcoming.