It means he was technically skilled as a boxer but had big power, much like a Tommy Hearns.
Power punchers CAN be crude in the delivery of their power, they can be stiff, robotic, or throw wide loopy punches. What made Lennox special was that he could be as he described a "pugilist specialist" because he was able to use the sweet science, the hit and don't get hit skill, but in the delivery of his punches he unloaded a lot of power but in a good clean, straight, technically correct manner.
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