Feebs11"be best off": Here it means that the player will do better if his swing is like that of a swordsman's.
Then what is the difference between that sentence and these below?
・”The batter swinging his bat was better if he was most like the warrior wielding his sword"
・”The batter swinging his bat was better off if he was most like the warrior wielding his sword"
・”The batter swinging his bat was best if he was most like the warrior wielding his sword"