We have a good bullpen and should still be able to trust Nola. Honestly I wouldn't mind seeing Sanchez tomorrow night if they get short, just because he's going to be so cold otherwise.
But let's get some runs - good start!
And relievers are just always hit or miss, no matter how good you are. One year you are Brad Lidge surviving Pujols and losing your job, the next you are having one of the great closer seasons of all time, the next you almost lose your job again. One year you are Ken Giles getting an insane trade haul; the next year your new team won't even pitch you in the playoffs.
As far as Seranthony specifically, they got more from him last year than they could have reasonably expected coming back from the injury. This year was a bit of a corrective. They were right to lock him up and hope for better going forward.