The "sports drink when sick" thing makes some sense actually. It gives you both the salts and the sugars you need in an easily drinkable form. Same reason people sometimes give their kids flat fizzy drinks when they are sick.
Also, I find it funny that all the comments about "the series is going constantly downhill" all mysteriously disappeared for the last few chapters when we got some actual good plot going on, yet now they are back acting like that was terrible too. (Including the silly translator notes)
That said, I don't mind the kid figuring out the murder, but how does he know about the syndicate?