In answer to the OP original question, no I don't think they'll rest anybody against us as it's 10 days between playing us and the Challenge cup Final.
In all honesty, I'm fine with Saints fielding whoever they want, we've done it a few times, but surely the bigger question to be asked would be.....
Would Saints have fielded the same team if they were playing anybody else other than the team currently sitting last on the ladder.
No,I don't think they would.
They can't be seen to be giving competition points away to teams around them in the league.
They didn't have to rest 11 players, and if they'd have only rested a couple they would now be 12 points clear with 6 games remaining.
Let's face it, nobody's going to be helping us out of this mess.