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So pretty simple, Rayleigh is Dark King and Teach has the Dark DF. Why no one related them as father and son?
Think about it, Rayleigh is Roger's right hand man. So they are very alike, thing similar etc...
Roger was a terrible father since he was so selfish to have a kid to keep his dream on but he killed himself because he didn't wanted to raise that kid.
Rayleigh did something similar but didn't killed himself since he wasn't going to die soon. And Teach is that kid.
Teach not only got the Dark DF which parallels his father being the Dark King but he also joined the biggest rival(not enemy) that Roger pirates ever had. Whitebeard pirates. And also he wants to become the biggest enemy Roger pirates ever had, Rocks pirates.
So that's it, enough connection for this to be true without complicating so much that Oda wouldn't be able to proccess.
Think about it, Rayleigh is Roger's right hand man. So they are very alike, thing similar etc...
Roger was a terrible father since he was so selfish to have a kid to keep his dream on but he killed himself because he didn't wanted to raise that kid.
Rayleigh did something similar but didn't killed himself since he wasn't going to die soon. And Teach is that kid.
Teach not only got the Dark DF which parallels his father being the Dark King but he also joined the biggest rival(not enemy) that Roger pirates ever had. Whitebeard pirates. And also he wants to become the biggest enemy Roger pirates ever had, Rocks pirates.
So that's it, enough connection for this to be true without complicating so much that Oda wouldn't be able to proccess.