Nolan Ryan has a point even though he basically is dead wrong.
The point is that a 6th starter is folly unless you don't have any really good starters.
With Porcello doing so well, Cora would be nuts not to keep Sale, Price, and Porcello pitching every 5th day and mitigating that with pitch counts, etc.
The point is that really good starters are often the difference between winning and losing, which is why they get so much money. And now we're going to give them extra rest? Give me a break.
Last year the only problem with Sale was the number of innings and pitches he threw in the first 4 months. Cora has already fixed that.
I'm glad Kimmi mentioned the three times through the order thing. I do think that is a factor, but also think your best pitchers (Sale, Price, Porcello) should be up to it and that the pitches thrown at that point plus their overall effectiveness in that game should determine whether a third time through the lineup is merited. And usually the two coincide--a pitcher who has only been so-so the first two times through the order usually has also used a lot of pitches.