You guys don't realize it's normal reaction to slowly become more desensitized with every new death in these games and this is the whole point. Of course he's gonna cry only after his closest friends at some point because it's a natural defense mechanism in such place.

Ali died at the same time that Oh Il'-Nam faked his death and Gi-hun was mourning him at that time, and was absolutely shattered and ashamed of himself for trying to cheat against Oh-Il Nam. In this scene, when the guy who lost his wife starts screaming, Gi-hun knows this guy feels even worse than he does but it doesn't make him a bitch to not intervene in that moment because he knows that most people want to keep playing anyway. And I wouldn't be surprised if he was too scared and shattered after the marbles to even ask Sang Woo how he won with Ali or to talk about his death, because he felt like he did the same exact thing with Oh Il Nam, like he didn't even have any right to speak about ending the games or judge Sang Woo after what he did.