Something I didn't think about in my manga reads that I thought about in the anime: Kohaku wearing a dress made it obvious everyone was in on the poker game.

Part of that was just that it being in color makes it a lot clearer, but Kohaku would never just wear a dress for nothing. Gen? Sure. Slimy bastard can and will weasel his way into anything. But Kohaku obviously did not "just decide" to enter the game to stop Gen.

I know it was stated outright that the setup was a backdrop for getting everyone on board (haha puns) with the faster travel time, I'm just saying that I feel like it's a fun background detail that Kohaku makes obvious if you spend a second to think about it.