Many relievers tend to have good years and bad years. He had a good year in Detroit and functioned well as a closer. It seems that Wilson is having a good year this year, and I would have no problem using him as a closer if needed.
However, Strop is also having a good year, and is functioning very well as the closer. I see no reason to give the closer job to Wilson, unless Strop needs a rest now and then, or if the opposing team has several good left handed hitters coming up in the ninth.