All this stuff about resting the starters just look how the mini-bye messed up their momentum. No you want to go in with a convincing win over the Niners.
You have to know, that Stafford, Donald, Kupp, and JJ are thinking RING! They will want to play and announce their arrival. No one wants to back into the playoffs. If you play a good game but still get beat, okay that's the NFL. But you aren't losing to a scrub team. Shanny won't want to back into the playoffs either.
Both of these teams know there is a chance they will face off in the playoffs. It could be as soon as the divisional round. No IMO both teams will want to make a statement.