With the debut of DRA Run Values coming last Friday—and a detailed explanation coming on Wednesday—BP Wrigleyville's Rian Watt takes a look at how the Cubs rotation stacks up with regards to these components. It's a staff that helped keep the Cubs in contention in the first half as they waited for a young offense to come around and start producing on a consistent basis. Just how good do the advanced stats think the staff has been? Go to BP Wrigleyville and read Rian's piece here.
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So you can read the 15.73 as saying that Arrieta has been 15.73 runs better than his peers, even after context is removed. Another way of thinking about it: it's measuring the same thing as WARP, just in terms of runs, rather than wins. Hope that's helpful!