http://www.youtube.com/watch?v=WR3Z0ecchYc
That must have been embarrassing for Ice.
For his Marth vs Kirby, he made two main mistakes. He fought to offensively and he thought that Kirby is less dangerous on the edge of the stage. There were some moments where he played correctly, like at 1:40, but then he gets greedy again at 1:48 and gets punished.
Ice also played pretty poorly. I could see many missed l-cancels in the first match and some very odd moves, like at 2:34. It appears that Ice got frustrated because he couldn't 4-stock a Kirby.
Something I learned when Mango first entered the scene and the Marth vs Jiggly match-up was still hot: Marth's best defensive move against Jiggly is his f-tilt. The same would probably also apply to Kirby. You can see that the landing takes too long to put up a fair wall against Kirby. F-tilt, jab and especially f-smash would probably be more effective. I can see d-tilt working too.
I also see Fox's advantage against Kirby now. It isn't so much the lasers that give Fox the advantage, as the fast nairs and bairs. Fox is also the best character at killing off the top, so it is easy for him to play the match in the center of the stage.