Why don't we take a look shall we?
Wren players
Freeman - 3.6
Albies - 3.6
Camargos - 1.4
Acuna - 0.5
Coppy players
Catchers - 2.2
Swanson - 1.2
Markakis - 2.6
Inciarte - 1.2
Players acquired by Coppy using Wren assets
Folty - 2.1 (Gattis - 0.7)
Newcomb - 1.3 (Simmons - 3.7)
Wisler - 0 (Kimbrel - 1.2)
Olivera - not in baseball (Wood - 1.7)
Hmmm, by my count, Wren is directly responsible for 9.1 fWAR on this year's team (he was GM. 4 years ago). Coppy directly responsible for 8.7 (he was GM last year), and Coppy managed to turn 7.3 WAR from Wren into 3.4 present day wins.
Meanwhile, when you consider the future value of the team, you'd take out Markakis and the catchers, which result in more than half of Coppys WAR this year.