For some reason they want to give him his 9 games, even though he's clearly not ready for any kind of real NHL role. And I guess they don't want him to do that with another rookie in Liljegren, so here we are. After 9 games, I fully expect Sandin to be back down in the AHL (otherwise I seriously question their ability to manage assets) and after that Liljegren may get a shot, especially if Dermott is not quite ready yet.
If Sandin was not there to be given a shot, and they don't like Harpur or Schmaltz, I think Liljegren would be there.