@Tejas @Jailer here is my Theory
Every Major Leader have a Child
Roger & Dragon who are Most Wanted Criminals both have a Biological Child they didnt meet, Luffy and Ace. However one ended up a Pirate like his Father and other didn't follow in his Father's Footsteps
Kaido and BM who were Biggest NW Villains both have a Biological Son whom Luffy met, Kata and Yamato. However one ended up fighting Luffy for sake of his Mother, while other fought against her Father for sake of Luffy
Sengoku and Akainu who are both Fleet Admirals seem to both have had a Child they found and raised, Corazon and Bonney, however one ended up being a Loyal Marine like Sengoku wanted and other became a Worst Gen Pirate which is what Akainu hates
This leaves us with Shanks/Mihawk and WB/BB
Shanks have an Adopted Daughter
Does this mean Mihawk also have one?
Apparently yes, everyone theorize Imu is Hawkeye's Mother but what if she is instead his Daughter !!!
As for WB, we got introduced to his Self Proclaimed Son Weevil who isnt really living the way WB used to live, so maybe BB also have a Self Proclaimed Son who is following his Father and thus became 10th Titanic Captain
8 Major Figures with 8 Children.
As for Imu, I believe she once betrayed Mihawk (Her Father) and Crocodile (Her Lover) and ended up sitting on Empty Throne somehow
This is why Oda made both have Knight Theme, they know each other well and both don't trust anyone cuz they were betrayed by someone very close
And Most Fandom expect them to recruit Doffy next, which clearly justify existence of Cross Guild
Mihawk, Croco and Doffy are only Pirates who know about Imu and thats why Oda is putting them together
As for Buggy, they wanted him to pay, so maybe he will tell them about Map of Captain John's Treasure which he acquired Pre-TS and it will lead to more revelations about connection between Celestial Dragons and Rocks Pirates
As for BB Son, feel free to speculate on why he treats BB as his Father