Mingo has no attack power to surpass Jozu's diamond.
Diamond is the world's most fragile material but Mingo doesn't even need to hit Jozu, he just had to let him it himself with parasite.
Furthermore if Mingo's parasite worked on Jozu that mean that Mingo's haki was stronger than Jozu's Haki and he could've cut him. :rolaugh:
 
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