Do we really think the FO thinks differently? Those two were 8/9/10 on the depth chart to start the year......(actually, I think you are saying this, just making sure).
The year has gone as badly as possible with SP this year, between injuries (Pineda, Maeda, Dobnak, Winder), and trades (Berrios) and ineffectiveness (Happ, Shoemaker) that this is what is left.
As for leaving him in, this is part of learning....
As for Kepler and Rooker hitting near the top (not your point).....I'm guessing they are trying to give them every AB possible, to see if they can get out of their funks. Nothing more or less than that.