Recently, the Tampa Bay Rays traded Chris Archer to the Pittsburgh Pirates for rookies Tyler Glasnow and Austin Meadows, and a player to be named later (PTBNL).
That PTBNL turned out to be Shane Baz, a top-5 prospect in the Pirates' system. The deal would be fair to the Pirates if Archer is actually an ace, but doesn't look so good given that Archer hasn't been producing like an ace. Given his actual performance, I (a Pirates' fan) would have preferred to send a lesser prospect to the Rays. (There's a chance that the other two players sent to Tampa Bay won't live up to their billing, so that might balance.)
Have there been any deals in the past where the PTBNL would be one person if the centerpiece of the deal (Archer) performed at one level, and a different person if he performed at a lower level over the "waiting" period?