You are dreaming if you are counting on Sale, Houck, and Whitlock. Sale, I grant you, looks like he is headed back, maybe even in early August. Plus before the shoulder went bad, he had like 8 solid starts out of 11. However, I think we need to count him has fragile until proven otherwise.
Houck and Whitlock are now expected back in September, not August. Plus they both had ERA's over 5. Whitlock has never been a consistent starter and neither has Houck.
In fact, our four best starters--by a wide margin--right now are Bello, Paxton, Crawford (yes, Crawford), and Pivetta (who starts in the 2d or 3d inning, which seems to work beautifully).