Crocodile secret . Blackbeard dark power counter

Crocodile What if the reason why crocodiles didn't use haki when fighting luffy cuz if uses it he will nullify the effect of the devil fruit power of ivankov that turned him from woman to man

When we saw first when kaido and big mom tremendous haki that they were throwing up and law couldn't move them with his devil fruit

And law when he got turned to women by Blackbeard doctor Doc Q and turned back to man by throwing tremendous haki and nullified it

Blackbeard

I would say the same thing Blackbeard will not be able to move devil fruit user with Vortex if they throw out tremendous amount of haki just like law / kaido / big mom.