Jumping up in weight has historically left challengers vulnerable against naturally bigger champions.
Yet in Las Vegas this week, many pundits and fighters are tipping Crawford to win – a testament to his adaptability and ring IQ.
Crawford looks ripped and defined, not having put on weight at the expense of his athleticism, but whether he can carry the same speed, timing, and precision into the ring remains the question.
He says the extra pounds have been more blessing than burden.
“It’s been different because I don’t have to worry about anything – the weight room, strength and conditioning, when I’m eating and things like that. I’m as happy as could be,” he told BBC Sport on Tuesday.
The freedom has even extended to breakfast.
“I woke up and ate pancakes this morning. I would never have been able to eat pancakes before,” he said.
If Crawford can dethrone Alvarez in Nevada, it won’t just be another indulgence. It will be the syrup on top of a career already dripping with greatness.