Houston Astros ⇄ Kansas City Royals

Close to a wash — the margin never reached a full win.

Dylan Coleman changed clubs, and none of them amounted to much for either side.

Justin Maxwell changed clubs, and none of them amounted to much for either side.

Jason Bourgeois, Humberto Quintero and Kevin Chapman changed clubs, and none of them amounted to much for either side.

Pat Borders and Rick Huisman changed clubs, and neither amounted to much for either side.

Mel Stottlemyre and Buddy Biancalana changed clubs, and neither amounted to much for either side.

Luis Pujols changed clubs, and none of them amounted to much for either side.

George Throop and Keith Drumright changed clubs, and neither amounted to much for either side.

Kansas City Royals got 21.6 WAR out of John Mayberry over 6 seasons. Houston Astros got -0.6 from the whole return.

Buck Martinez stayed 8 seasons and was the best of it, and it still came out close to even.