Just my theory and nothing more than the results I've gotten with my hitters. Just like pitching, there's a power line to hitting. In pitching, the power line is wherever the body/toes land in relation to the hips/body. The ball being released in relation to their body/toes/hips will result in the fastest velocity of pitch. IMO, the bat, traveling along the same aforementioned body relationship and power line will result in the fastest bat speed. As you can see, he builds a nice corner as well as pulling the knob through with his front hand and elbow. This is the cue I like to use versus "knob to the ball." Front hand and elbow pull will result in the same action without undesired results from misunderstanding the verbal cue. Also, notice how he is "throwing" the bat down the power line in relation to his body position.
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