I for one would be very excited if Bellinger came here and don't consider him a reclamation project. Even in a s*** season, he managed 1.7 WAR in 535 PA versus Hernandez 2.4 WAR in 550 PA last year. A 0.7 drop that should apparently be made up with the BP help from the Seattle trade. That 1.7 in value comes in the form of what the Jays need - baserunning, defense and lefty bat. Worst case scenario Bellinger lands somewhere between platoon bat and good Brad Zimmer and puts up 1-ish WAR with his dying skillset used correctly. Best case scenario, this dude receives some Bautista, Smoak and Encarnacion magic and adds about 40 OPS+ belting 40 home runs with a .230 batting average and a WAR that probably approaches 4.
On Bellinger's side, the Jays are an ideal match. A playoff team with a good offense but just so happens to have a lack of depth at the position he plays. So he'll get more leash here than he would with the Yankees or Dodgers. But at the same time he can rack up a ton of counting stats if he does produce. The Jays/Dome also have a history of turning guys around. With the aforementioned three plus Semien.