Agreed, and let's consider another angle.
let's say that Pomeranz gets through this season as a Padre, or on a different team, and does live up to the billing.
Does anyone honestly think that at that point any team that wanted to trade for him, with those further 2 years of control, could get away with paying nothing but an A ball teenager, however high the ceiling is, for a guy like that?
Scouts are saying this year's version of Pomeranz is for real and that it's very possible that the breakout can be sustained. If that is the case, we got him at a discount. The pitcher Pomeranz was projected to be at the draft was every bit as good as Espinosa's projections when we acquired him, if he has had his breakout and reached that potential, then we traded a top 5 prospect for the guy top 5 prospects try to become and cashed on on the lion's share of Espinosa's potential 5+ years early. Trading large unproven potential for a reality nearly as large is always a good trade.