Our agency nurses get the easiest assignments since we often don't know them well and they may not know much about our unit. It isn't a good idea to give them the sickest patients.
I did have to laugh one day when I came on and got report from an agency nurse who thought her assigment was the worst in the unit... She didn't realize there was a whole nother room with sicker patients! Her/my assignment was one of the lighter ones