I wouldn't be surprised if Orr is out this week through injury - looked to pick up a knock towards the end of the game yesterday and was hobbling for the last few minutes.
I've never been into this idea of resting players - by doing that we're effectively writing off the Saints game which would be foolish in our current position. While Saints are going well we are capable of beating them at home and if we did that would be 2 more points towards finishing in a play off spot - a position we're by means guaranteed to make as yet.
Also, it would be great for confidence to go into the semi with a win against Saints under our belts.
Bottom line - if a players carrying a knock rest him, otherwise play your strongest line up....