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As best I understand it, the point of the princple is maximum efficiency.
If the assumption is that it takes 10 total units to throw someone, if they attack with 8 units, one only needs to use 2 units to generate the 10 total units needed to throw.
IMO, it's just made-up example to teach a principle, as such it grossly simplifies a number of things
Regards,
Paul
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