I don't know the reason why they got to the Dark Side, but at least Otake is drugged for sure as it seems that he got Gourmet Cells and as it was implied he was a Chef who was around 100 best chefs, so he might not be an easy opponent, especially as we know that Bishokukai have tons of delicious ingridients, thus they can manage to develop even a weak person in a strong one after giving him Gourmet Cells and feed him with tons of delicious ingridients.
I was wondering why shimabukuro show us komatsu ribs and spine , maybe is a clue to how komatsu avoid the attack??
Yes, it might be a clue and it might happen to be something like he felt in Gourmet Pyramide, when he felt a strong hostility from Nitro who wanted some food and he felt as if he was pierced by Nitro.
On the other hand it might be real that he was not only stabbed, but pierced up to his spine... then he might not only be injured, but also immobilised.
Zebra accomplished his task and got stronger in the process, Sunny learned a technique from the guardian at the edge to Gourmet world and so forth.
The thing I like about Toriko is that characters can develop independent techniques and evolve on their own terms. Not everyone needs to be a Super Saiyan, Bankai User, Hermit Mode or Devi Fruit User. Everyone can have their own distinct set.
Now that I created an account I am going crazy and deciding to post in all the forums I usually read, with that out of the way what I was thinking is that perhaps Komatsu getting stabbed was real and is a requirement for him to eat the Bubble Fruit that Toriko is going to bring back. Toriko had to bring himself to the verge of death for it to appear, so maybe as Komatsu is bleeding out Toriko will show up, the bubble fruit will recognize his appreciation for food and pour so many nutrients into his body that he will auto heal. Just a thought.
As a prediction I would say that the upcoming chapter, I believe, will be based on Komatsu and especially on Chin vs Chiyo. I believe Toriko will show up at the end of the chapter or even in the next one. Though I might be wrong and the conclussion of the Arc will be decided quicker.