@RapidLord I don't think this chapter necessarily points to Baku planning on losing the StL challenge. Him being the one who planted the idea of Labyrinth gamble is simply him being true to his words and creating circumstances where an exciting gamble will come to his way in the future. That's why he got the nosebleed, he got excited thinking about how interesting the gamble that will be made possible by the idea he planted will be. I think it's more likely that Baku is still serious about StL at this point. I mean, it's definitely possible, but even though he planted the seed, he had no way of knowing precisely if it would bear fruit, he also did not know at this point that he wouldn't die if he lost the StL challenge, because at this point in time Tatsuki is still the leader, and I'm not sure if Baku knows that Hal is related and might inherit Kakerou from him, which would be the only scenario where he actually survives after losing the StL game. That's why it doesn't strike me as that likely that Baku is already planning to throw, but we shall see.
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Hal's determined look seems to suggest to me that he's planning on becoming the Leader of Kakerou as fast as possible, in order to have a rematch with Baku and beat him this time during the StL game (or something like that), which is why the chapter said the seeds one unknowingly planted without being aware of could also grow into an unexpected poison while showing his face. But remember, it's not yet the 23rd, so probably in the next chapter or two we will see the truth about Hal's death/disappearance/memory loss. Then, two and a half years after that, Souichi is the Leader of Kakerou and Baku and him play against each other, and I still think that Baku losing is related to him not being aware that Souichi was alive.
@Ominous I wonder if Baku will ever use the right to Kaji's life explicitly. At that point there was no other possibility to play the StL game, so he had to make use of Kaji, which is also one of the reasons why Baku made Kaji feel indispensable to his plan, because at that point he was (and maybe/probably still is); but interestingly enough, the seed he planted in this chapter was what enabled him to get rid of his StL loss, which means he is able to challenge it himself without having to use Kaji as his representative, so I'm not sure if Baku is still planning on Kaji being the one actually challenging and him being behind the scenes making the moves. It's not necessary anymore, but I guess we'll see.
@Jonui I totally see what you're saying. I think it's good that the author is showing that Baku is just as OP if not more (he did win the book gamble, after all); although present Hachina is a much stronger opponent than Hal, since he's become much more ruthless and wouldn't do things like help the opponent by catching the book when it fell off the shelf, or not being willing to lower a book's value to win the gamble (like Baku).