Hinokizu

I think Hound is Kadar and that he is Hinokizu.

Shiryu speculated that Hinokizu is a government man which Hound is. Laffitte that he is power user due to his ability to sink ships in giant vortices.

Kadar's ship was reported as sunk by the Sun Pirates but I think he sunk his own ship with a vortex.

Fisher Tiger said he would let Kadar go which I think is what happened. Kadar showed fear when being dangled over the sea which I think is a sign he is a Devil Fruit user.

Later on Fisher Tiger reprimanded Arlong and Jinbei for going too far I think further supporting that they didn't sink Kadar's ship.

I think Hound is the one who gave Luffy the food and has been sabotaging the government for a while.

I think is responsible for Luffy's new wanted poster keeping his initial and using the Nika picture.

I think he hacked the den den mushi to take the picture of Cobra's assassination and sent it to Morgans.

I think leaked the government's plot to assassinate Vegapunk as well.

I think he has the tell-tale signs of a traitor. Questionable dialogue he suggested canceling the Buster Call and inaction he wasn't shown fighting at all.

I think the reason he is a traitor is that he is the child of one of Saturn's test subjects. I think he inherited the chemical and was successful.

It was hinted in the manga and more in the anime that Law has a connection to Hinokizu. White Lead Disease was brought up when Kuma was looking for a cure to Sapphire Scales.

I think Saturn's experiments are the source of the disease and that it being known in the "lower world" is a sign he has been doing them for a while and releasing test subjects.

I think Kadar is the marine that captured Ginny and will rectify it by killing Saturn.

I think it has been forecasted that he will die. He brought up the irony of Bonney being killed by Kuma's own clone. I think Saturn will suffer poetic justice and be killed by the results of his own experiment.

Hinokizu has the last Road Poneglyph and needs to be found to find the One Piece.

My theory is that he is Squard's former captain. His epithet is Maelstrom Spider and according to rumors Hinokizu has the ability to create maelstroms to swallow ships.

I think Squard's former captain survived the destruction of their crew too,

But I think he was captured and used for a guinea pig in Vegapunk's ancient gigantification experiment.

I think he is the zero of the Numbers like how Kuma is PX-0 of the Pacifistas. The first person the experiment was done on. This is a pattern in One Piece for groups/organizations that are number themed. Crocodile was Mr. 0 in Baroque Works. Cipher Pol has CP-0 and Reiju is 0 in Germa 66,

I think after being bought by Kaido he defected from the Beasts Pirates. I think for some reason he was able to retain his intelligence or regain it.

The manga hinted that Law knows Hinokizu and it was emphasized even more in the anime. I think it has to do with his time at Punk Hazard. His cover story was to learn about the traces of government research there.

I think Law did really do that. He was the one that revealed that the government did gigantification research to the Straw Hats. His explanation was tiny foreshadowing for the Numbers.

Shiryu believes that Hinokizu is a government man I think in a sense he will be right, I think Hinokizu was a prisoner, a ward of the state. I think him saying it might be foreshadowing too since he was the Head Jailer at Impel Down.

I think the oversize sword Squard's wield might be a memento he kept of his captain.

I think Squard's captain was a large human like Whitebeard. Whitebeard was shown side by side to Squard and it looked like the sword was right size for him.

A big hole in my theory is that an obvious clue about Hinokizu is that he is an ancient giant. I think he could have the ability to control his gigantification similar to Luffy.

I think Weevil is the man with the burn scar.

Miss Buckin claiming that Vegapunk could prove Weevil's kinship to Whitebeard adds support to the theory he is a failed Whitebeard clone.

She herself was successfully cloned by MADS which she was part of. And was a Rocks Pirate meaning she had access to Whitbeard's bloodline elements.

If Weevil is a clone of Whitebeard he could have his memories which would be significant.

The last road ponelgyph was originally located on Fish-Man Island.

Which was previously under the protection of Whitbeard who Roger revealed some of the secrets of the world to. I think it's very possible he knew the last road ponelgyph was there meaning Weevil could too.

Since Weevil was captured by Greenbull there is a theory he will get a glow up.

Which would be a cool callback to this scene. But I think Weevil is a character that was already introduced.

I think Weevil is Kadar a rear admiral that fought the Sun Pirates. I think there is a mystery around since his ship was sunk even though Fisher Tiger promised to let him go.

Shiryu speculates that the man with the burn scar is a government man. Laffitte that he is a power user, since he rides in an all-black ship that swallows enemy ships in gigantic vortex if they wander to close. Kadar is a marine and his ship was sunk.

I think Kizaru is another hint, he took the reports for Kadar and Weevil which I think links the two.

Again I don't think the Sun Pirates sunk Kadar's ship. Fisher Tiger berated Arlong and JInbe for going too far. Arlong said he only killed one or two people.

I think Weevil ate the Hito Hito no Mi, Model: Umibozu. The umibozu is a yokai that takes the form of a monk that sinks ships. The umibozu was mentioned a few times.

Similar to Onyudo (Wadatsumi's epithet was Onyudo) before it appeared as a human zoan fruit.

I think Weevil awakened and his zoan powers consumed his mind which is why he is simple minded like the Jailer Beasts.

It think Weevil will regain mind utilizing powerful haki.

If my theory is true I think Weevil got disillusioned with the marines like Diez Barrels, went awol and sunk his own ship.

I think he Awakened in Wano. His neck scar looks like it could have been inflicted by Queen's collar. Apparently body parts can be reattached in Wano and Weevil's arm looks reattached.

I think Kaido tried to recruit him to army so sent him to the Prisoner Mine to break his spirit but he escaped.

I think Weevil's burn scar will be on his back where Whitebeard had his Jolly Roger tattooed.