Hello everybody!
Today I want present to you a theory about the relationship between Hakuba / Cavendish & Mihawk.
When Cavendish was transform to Hakuba in the
episode 712 I notice that his eyes looks like Mihawk’s eyes as you can see in
the picture above.
For explain this theory, Let we starting with
analyzing the first name of Mihawk: Dracul.
This name
was inspired by the vampire count Dracula,
But
originally Dracula is a history written by Charles Darwin, when the queen
Victoria became the queen of the Great Britain in 1837, his reign continued
until 1901, this period is nommed by the Victorian Era, in this period it was
forbidden to talk about politics, this is why Charles Darwin wrote the story of
Dracula to talk about politics indirectly.
This story talk
about gevernor hawks and ordinary hawks whose were oppressed by the gevernor
hawks. There was a governor hawk nommed Mi and felt what the other ordinaries
hawks felt, and he thought that all hawks should be equal.
Mi and his friend Hak decided to make a revolution and as expected they made a revolution but the villain king predict such a thing, and he mad a drug that will transform that hawks in a gigantic hawks.
Mi was able to control this evil powerful after drinking the Drug and he
used to be stronger without becoming evil, but Hak couldn’t control this evil
powerfull at 100%, and he transformed to a monster from time to time.
Now we can see that Oda inspired the character of Mihawk from the hawk
Mi. Because his name is Mi and his last
name is Hawk like : MiHawk.
And he inspired Hakuba from the other hawk , Hak is the hawk who was
transformed to a monster and who was losing his control from time to time.
This is why it should be had a relationship between Mihawk and Cavendish.
It will reveal in the future.
Also Mihawk and
Hakuba, both are swordsmen. 
between Shanks and BigMom.