With Rendon's swing, he looks like a 20 - 25 HR guy who hits .300. That's the classic star, a Bernie Williams who happens to play infield.
Some home-run hitters do it with muscle: Mantle, Killebrew, Allison, Hondo. Some with the perfect swing: Aaron, Mays, Banks, F Robinson, Ted Williams. We can't expect him to become Aaron of Ted, but I hope Rendon continues to swing well and connect with the fat part of the bat. If he doesn't hit 40 homers, that's still good: try to be a hitter like Barry Bonds before steroids.