Having Osuna as the closer would be a waste. He would be a bigger benefit to the team as a starter. But the Jays also need to invest on support. Right now you have only Stroman, Hutch for the rotation next year, team will likely bring back Dickey and putting Osuna gives you 4. You need to get at least a Zimmerman or Shark for this team in the offseason, if not another one pitcher still on top.
I don't expect the team to trade Hutch when his value is at his lowest but I wouldn't be surprised if it happened either.