There’s no question that Roberto Osuna is an incredible talent at the back end of the bullpen. Despite his struggles in 2017, he was extremely dominant through the middle of the season, and amassed a 1.74 FIP and a 3.0 fWAR. The 3.0 fWAR put him right behind Kenley Jansen and Craig Kimbrel for the most valuable reliever in baseball. He is pretty darn incredible and he’s only 22 years old (23 in February).
Despite all of those great stats from 2017 and the previous two seasons, if the Toronto Blue Jays want to move someone to get a haul back, trading Roberto Osuna this offseason as opposed to Josh Donaldson makes more sense.