Back in December of 2016 the Royals traded away top closer (and human/robot hybrid) Wade Davis straight-up for a young outfielder named Jorge Soler from the Cubs. The move was highly controversial among Royals fans. Many believed it was a solid move to trade one season of Davis for several of Soler, and others believed the return to be far too light for a pitcher who arguably had the best 2-3 season run of any relief pitcher in history.
Soler struggled to stay healthy in 2017 and 2018, appearing in 96 games and accumulating exactly zero fWAR over the time, but being under contract through the 2021 season there was some hope that he would eventually become the middle-of-the-order power bat he was projected to be.