Spence isn't that much bigger than Bud. Height and reach are very comparable (giving up 1 inch of height and 2 inches in reach) and they walk around near the same weight. Crawford has made several IG posts weighing in the 170s.
In fact, I think Bud came in heavier than Spence did in their last fights at WW. On the same day weigh-in.
It's not some dramatic difference in size. Spence is just likely stronger.
Spence is physically bigger and been fighting in much bigger classes.
Crawford was a LW at the end of his Am's career, Spence was a JMW most of his Am's career.
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