I don't think Shadows of the Empire is on the same level as the films but is still pretty high canon. I would have to guess that the highest level of canon next to the films would probably be the "clone wars" cartoons. This is because George Lucas was directly involved and builds up directly to EPIII and has things in the movie that you would need to see the cartoon to understand (ie why grevious was coughing in the movie, which was because he is force choked by windu). Since Lucas is planning on redoing the cartoons as longer, 3d animation I think this canon will be expanded. anyway back to the point, if Kyle is in I think it is a good bet that Dash will be in. Plus he has his own ship which allows him to participate on land and in space.