Lorenzo Cain is a star in the outfield, and it's hard to imagine that would be any kind of a controversial statement. By Outs Above Average, the Statcast™ range-based metric, he's at +16, which puts him in the top 5 this year, just like he was in 2017.
While Cain is having a good year at the plate in his first year with the Brewers, hitting .311/.401/.427 with 10 homers and 28 steals, it's his defense that's putting him in the National League Most Valuable Player Award conversation.