[Oooh, he smells cover-up. He laughs.] Ah, well. We did do many stupid stuff, and there's many great memories from those, so I don't really mind if he tells.

[Luckily he's already swallowed his tea when Marco mentioned the name. So none of that choking over his drink. He does spill some over his shirt when he unconsciously tilts his cup while raptly listening.]

...W-Whitebeard. So that's why. I mean, I guess I can see why Ace'd want to kill him. His name being tied to Roger's like that... [Granted, Sabo doesn't know the details why Ace hates Roger so much, but he could relate to it somehow. Not everyone is lucky having a great parent.]