My understanding of disconnection, as I thought you used the term, was from the link you have used that includes words of disconnection under a hitter that looks to disconnect with their lead arm.
Certainly could be an example but I don't mean it to be the lead arm disconnecting from the chest. I mean an efficient transfer of energy from the rotating torso is good connection/connecting the rotating energy of the torso to the bat with as little misdirected energy as possible. My apologies for being unclear.
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