Really interesting turn of events.
We could have seen it coming but oh well.
Now, the pieces that have to fall together.
Why did Dofla killed his brother 3 years before the big plan?
Why did Dofla killed one of his family, a family he protects at every cost?
Why Dofla is so interested about Kanjuro and Momonosuke?
Did some other big event happened 13 years ago in story time?
From OPwikia
15 years ago
A year after escaping, Fisher Tiger, the adventurer, goes back and scales the Red Line and attacksMariejois, to start a rebellion that ultimately frees all of the slaves of the Tenryubito, including Boa Hancockand her sisters.[[36
]](http://onepiece.wikia.com/wiki/World_Timeline#cite_note-TigerMariejois-35)Fisher Tiger rebrands the mark of the Tenryubito on the freed fishmen slaves into the mark of the sun, and forms the Sun Pirates.[36]
The Boa sisters are found by Gloriosa, Silvers Rayleigh and Shakuyaku, who take them back to Amazon Lily.[36]
Under the orders of Donquixote Doflamingo, Vergo joins the Marines.
13 years ago
Vivi becomes the Sub-leader of the Suna Suna Clan.Toto and his son Kohza set off from Alubarna to set up a village in the Oasis of Yuba.
Boa Hancock becomes the new empress of the Kuja and the captain of the Kuja Pirates. She is also given a position in the Shichibukai.[37]
12 years ago
Red-Haired Shanks, then twenty seven years old, arrives at Luffy'shometown and decides to stay there.[38] Luffy accidentally eats the Gomu Gomu no Mi, giving him rubber powers and an inability to swim.
Higuma is eaten by a Sea King in an incident involving Luffy and Shanks.[38]
Shanks leaves Luffy's hometown after staying there for almost a year.[38]Shortly after Shanks' departure,
Luffy is taken by his grandfather Monkey D. Garp to train with Curly Dadanand meets his adopted brother Portgas D. Ace.
Luffy soon forms a brotherhood with Ace and Sabo in desire to becoming pirates.
Sabo is attacked by a World Noble, and is presumed dead.
The Tenryubito come to visit the Goa Kingdom on Dawn Island.
The Bluejam Pirates set fire to the Gray Terminal in preparation for their arrival, but most who reside there are saved from being burnt to death byMonkey D. Dragon and the Revolutionaries.
When the Tenryubito arrive, they appeared to have murdered Sabo as he leaves his home island in hopes of being free from being a noble by becoming a pirate.
The pirate captain, Montblanc Cricket, arrives at Jaya.
He stays to search for proof on whether his ancestor was or was not a false witness, so he can be liberated from his family curse. His crew abandoned him shortly afterwards.
Chouchou's owner, Hocker sets up his pet shop in Orange Town.[39]
The famous actress Victoria Cindry dies in a tragic accident. Dr. Hogback meets the Shichibukai Gekko Moriah, along with Absalom and Perona.
Last time Hatchan visits Shakuyaku and Silvers Rayleigh after joining the Sun Pirates.
The Revolutionaries start to look for Nico Robin.
The Sun Pirates meet Koala, a young girl who was a slave of the Tenryubito. Fisher Tiger rebrands her slave mark into the mark of the sun, making her the very first human to bear the Sun Pirates' emblem.
Upon returning Koala to her home island, Fisher Tiger is ambushed by Marines led by Rear AdmiralStrawberry. After barely escaping the island with a Marine ship stolen by his crew, Tiger chooses to die rather than receive a transfusion from the human blood on the ship.
Angered over Tiger's death, Arlong heads back to Foolshout Island to get revenge on the humans who betrayed Tiger, only to be defeated and captured by Vice AdmiralBorsalino. He is then imprisoned in Impel Down.
Seems quite a hectic period.
The world seemed in quite a changing period.
What we know is that when Dofla started his plans, getting Vergo into the Marines, Corazon was still with him.
By the way, it seemed that either Corazon didn't either knew about Dofla killing their father or was ok with it.
Discovering Dofla killed their father could be a good reason to start an argument.
Last question, why Corazon was Law's benefactor?
Last bit of infos, Law was 13 when Corazon was killed, and Dofla was 28.
Dofla lost his mother when he was 8, so Corazon couldn't have been older than 20 years old when he was killed.