Why would you mess with the top scoring line? Burrows is a better match with the twins. He knows exactly where to be, all the time. He's like the 3rd 'twin'. Kass needs to work on his game and earn his way up the lines. I would like to see him get some PP minutes, as he has the size to create havoc for the goalie and is good at chip ins. Hopefully his game will improve so that he can be put on the Sedin line if another team starts to work them over. IMO Kassian is a project that will take some time to reach his potential.
Sedin Sedin Kassian will most likely be the playoff line because when the whistles go away, so does Sedin effectiveness unless you can put a talented hulk with them. A good way for Kassian to reach his potential is by playing with elite players (as Sundin rubbed off on them)