This is fair. In which case it simply becomes an assessment of the Jays 2018 chances and whether the risk of holding onto Donaldson is worth that chance.
The Donaldson injury risk, using a simple L-M-H scale, was M at least. The guy played through a calf injury the entire 2016 season, played injured again the first part of 2017, then missed a big chunk of 2017 games due to the same calf issue. Given that history I would grade his 2018 injury risk as somewhere between M and H.
And you all know what I thought of the Jays 2018 chances, so of course I was saying trade the guy the entire 2017 offseason.