Devil Fruits possessed abilities that could counter one another—for example, Enel and Luffy.
Then there were the Diamond-Diamond Fruit and the Mochi Mochi Fruit. Katakuri held an extremely clear advantage over Jozu. The Diamond-Diamond Fruit did indeed provide formidable defense, but its offensive capabilities were clearly terrible. Katakuri's Mochi Mochi Fruit not only possessed immense offensive power, but also powerful adhesive and restraining properties. If Jozu had still been "Diamond" Jozu, Katakuri would have stuck him down in a single exchange, leaving him unable to move.
After all, softness could overcome hardness.
But Jozu was no longer "Diamond."
He was...
Whitebeard Jr.!!
Facing Katakuri, who had chosen to clash with him head-on, he did not meet the attack directly. Instead, he stepped back half a pace, raised his fist, and poured all of his strength into it.
He had only learned one technique from his old man so far, but that single technique for wielding the Tremor-Tremor Fruit was already enough.
In an instant, he punched the air not far from Katakuri.
The entire wall of air seemed on the verge of shattering, splitting apart in all directions.
Katakuri's pupils contracted violently. He had never expected the Whitebeard Pirates to possess a way to freely extract and replace Devil Fruits without paying with their lives.
Clearly, Whitebeard's Tremor-Tremor Fruit had been extracted and given to Jozu, while Jozu's own Fruit had not gone to waste and had been consumed by Whitebeard.
At Whitebeard's level, Devil Fruits were merely the icing on the cake. Big Mom's Soul-Soul Fruit created Homies partly to give her a few helpers, but more importantly, for fun. Kaido's oni form was most important because it allowed him to drink a thousand cups without getting drunk, letting him happily gorge himself on fine wine and beautiful women