@RapidLord
Yeah the pg8 line is weird, but it is indeed correct.
I also thought it was weird for the kariume to be medicine, since Kaji also ate it as well, early on IIRC. But perhaps if there was some actual medicine applied, the taste would've been covered up by the kariume, and the people eating wouldn't notice, and it wouldn't have any negative effect in low dosages. I was thinking that during protoporos, there were two possible hints of the kariume being modified medicine: 1) Baku knew how to order/package kariume, 2) Lalo putting drugs in the food. Combining those hints, maybe Baku had a personal supplier that he instructed to put his medicine into the kariume. And maybe he ordered kariume from that source too during Protoporos.
But I think the source of plums simply being good for the heart is also a likely possibility as well.
One interesting thing I just noticed about Baku's stamina - at the start of the manga during the abandoned building, he gets tired after
running up a flight of stairs. Then before the gamble vs Leader, he gets tired by
walking up stairs. Wonder if that was an additional hint that his stamina was not just low, but was actually decreasing, and so would eventually lead to this.
@Veshv
I wonder how he even got into contact with Abi Khan in the first place, since he should be on the same level as Lalo and Al Hizbul's leader in terms of being hard of meet. So many questions indeed.
I'm thinking that his motive might also include getting his original heart back as well, since it seems like he didn't bother to get a new heart even though Baku probably has the money and connections needed to get one.