The most basic underpinnings of training with the heavy sword lay in combining battle-qi along with physical strength in utilizing it.
Right after the adamantine heavy sword had been forged in the city of Hess, when Linley had used the adamantine heavy sword to attack the violet-robed Special Executors, he was not capable of combining his strength and his battle-qi to use the heavy sword in a meaningful way.
The heavy sword was not meant to be used with pure brute force.
It lay in conserving every little bit of strength to allow the heavy sword to reach its maximum possible velocity, while at the same time combining physical strength and battle-qi to reach the most optimal level possible.