@eegarcia:
Well I wanted to see them talk about "D", but Sengoku is still a Marine and when he was a Fleet Admiral he surely know about the "D" thing, but certainly as a Marine this information is forbidden and he won't tell this to a pirate, this part was just an emotional conversation about Cora-san.
And on Law's side, Law wanted to find out how was the relationship between Cora-san and Sengoku. That's all. Give it a try to the emotions xD
I felt nothing. And I'm used to One Piece causing me to feel so that's kinda sad.
@herpdat:
The takeaway from this conversation is, I think, that Law has accepted Cora's acts of kindness as a case of genuine love and that he continues to be interested in the meaning of D.
Now, why would Law ever doubt Cora's motivation?
Of course, fresh off Cora's death, Law knew Cora loved him (sacrifice and all, duh), but was also now aware of the importance of his name (the D. will surely bring forth a storm, natural enemies of the gods, etc.). In the years after Cora's death, Law witnessed the outrageous rise of Luffy (who he calls a bringer of miracles based on the destruction of Enies Lobby and the impact at Marineford). I imagine that Luffy's triumphs brought back Cora's warning in Law's head. Law then witnesses Luffy irreverently punch a Celestial Dragon and confesses to having witnessed something incredible. This renewed fascination with D. and with Luffy lead Law to help Luffy escape Marineford on a whim. As he reflects on everything afterward, I imagine he began thinking of how Cora, with little explanation, saved him. He thinks of how Cora had no obligation to help and love him, especially given the adversarial way that they met. Now Law, who's been planning revenge since Cora's death, questions the authenticity of Cora's love. Cora, who (in Law's view, anyway) knew of D.'s importance, may have just been destined to help him survive. For somebody who's planned revenge based on the strength of this bond, suddenly feeling that Cora's love may have just been destiny at work would be incredibly deflating.
Yet he continues, because he believes in their bond. And at the onset of his vengeance, what would you know? Luffy shows up by pure chance on Punk Hazard! Law, convinced more than ever of the mysterious fate and luck D. carries, seizes the chance to use Luffy's luck to his own advantage. But hold on; Doflamingo (Law's sworn enemy) was a Celestial Dragon! And last, get this: Law and Luffy (the D. combo) oust Doflamingo!
So, in light of this outrageous success, Law more than ever believes in the luck and mystique that all called D. carry and needs to know what it all means and hears that Sengoku has arrived at Dressrosa (former Fleet Admiral who as such may know the meaning of D. and who Law suspects/knows had contact with Cora). Sengoku then proceeds to confirm that he knew Cora, informs Law that Cora knew next to nothing about D., and tells Law to see Cora's love as just that: love.
In short, this conversation validates Law's belief in his bond with Cora, validates his revenge as something honorable, and leaves no answers as to what D. means (which I'm sure will be a factor in having Law stick around with Luffy in the upcoming confrontation with Kaido).
Most of what you wrote was true before he spoke to Sengoku. The conversation validated it yes, but it was the bare minimum needed to do so. The conversation lacked weight and it was what felt like a throwaway line. Law has to take a single line at its word. Sengoku cold have at least been more descriptive about Cora-san caring about him.
@Razh:
It's a little ironic when Sengoku says Rocinante knew almost nothing of Ds considering the latter at least provided some info on them.
The fact Ds have tragedy in their lives is not much of a reveleation at this point.
I know right? We've learned a lot from someone who "knew little". Lol what?