Howard's best years were when he had the bat speed to wait at the plate an instant longer and let the ball go deeper. That enabled him to hit balls in the air to the opposite field more. It was not a change in approach in his later years though. It was a decline in his skills. He always had a pull heavy power approach. Until his late 20s he could adjust within that approach to hit more balls the opposite way with power. In his later years he could not make that adjustment.
There is a reason just about every slow left-handed power hitter gets the shift employed against them. Because it works. But offensive players also do not change their approach because it also works the best for them. It is a power hitter's game and it takes immense skill to hit for power to the opposite field at a high rate of success. Lots of lazy fly balls, pop ups, and called strikes occur when they don't have enough skill.
Martin seems willing to hit the ball on the ground in situations and bunt. Obviously we are only looking at a highlight video. Pro ball with wood bats is harder. The ball may not carry further with the newer composite bats, but I imagine there is a larger sweet spot and Martin will not be able to get away with some of his college swings. I think he'll have to hit the ball on the ground more. With all the Samuel talk his offense is also not unlike the Kingery of today who has added 15-20 HR power. He's faster than Kingery but the power is still mid-level and its not like Kingery does not have plate discipline issues as well.