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He'll cost us several elite prospects and current major leaguers, to be sure. But we have more than several elite prospects.
I would start any package with Morrow, Triunfel and Carp. You can work your add-ons in aroud that trio. And none of those guys are can't-miss prospects...but all of them have huge ceilings. The Mariners can probably afford to lose that group plus a couple fo riskier guys.