"I see something in your playes that you don't."
That seems borderline arrogant. But is that what's really happening? Everyone's got statistics and whiz kid minds. I think something simpler might be at work--an old fashioned idea. For example, in the fan bases of Milwaukee and Cleveland, there's now a push to have the Indians and Brewers swap Domingo Santana for Danny Salazar. Not because their current teams don't understand player value...but because the the Indians have 'extra' pitching, and the Brewers have 'extra' outfielders. (Is Michael Brantley EVER healthy?)
This seems to be JD's pitch, as well. The D-Backs had both 'extra' outfielders and infielders...and so Taijuan became a logical two-for-one. Then he figured he had (or could acquire) enough offense, so Tank was an expendable price for Gonzales. (Of course, we shall see how that one works out).
The fly in the ointment, of course, is that now virrtually everyone wants pitching. So how do you get it? I think Leake and Erasmo are the JD kind of answers. But the right ones?