This post is analysis free. It’s just a list followed by amazement. Here are the best hitters (by wRC+) through their age-21 season, all time.
That list is Mike Trout and nine players in the Hall of Fame. Through this point in his career, Trout has been better than all of them. This is only considering what a player does at the plate, and ignores Trout’s contributions in the field and on the basepaths.
To this point in his career, Mike Trout has been Ted Williams if Ted Williams was fast.