Poor Kara, hope she's feeling better soon.
Actually I'm not sure about the choreographing - they do get coaching, as Wiki says, which isn't the same thing. But I do wonder if they simply could have time to do all that choreography with the amount of training they have to do as well.
This does not detract from the fact Matt's showdance was dreadful.
I like the idea of extending it and letting them use props and stuff. I really do think this format isn't working.