The more I look at his stats and read about him, the more I am convinced he was just different from the other guys. He was intelligent and a student of the game and virtually his entire focus was on hitting. He had great eyesight and reflexes. He came to MLB when day games, in which hitters prosper more than pitchers, were normal and later decried the emphasis on night baseball.
I think David Ortiz was somewhat like Williams--a lefty hitter who definitely preferred to pull the ball, even at Fenway with the deep right field. His career OPS was a terrific .931, and, outdoing Williams in just one respect, his final season, 2016, age 40 (his 41st birthday was in November), his OPS was an unbelievable 1.021. He think he was helped by his willingness to learn how to hit to the opposite field. Reportedly, Adrian Gonzalez worked with him.