The first case you cited was one I discussed in detail in Post #341. It does not support your case, as I explained.I already provided links above and a screenshot of one case in particular where two previously unknown aka "random" buddies were involved in an accident and one was sued.
I can't possibly be any clearer. But since you can't be bothered to do your own research, here's some more examples for you that I found in a quick search. Before you try to correct me, please allow me to point out that the examples in this particular article pertain to buddies who knew each other so they did not qualify as "instabuddies" but they do show the liability involved with being paired with another diver.
in Dao v. Shipway, an unpublished decision, a California judge granted summary judgment to a buddy because the friends were “engaged in a voluntary, active sport with inherent risks” of which the victim was aware. Although Doug Shipway (1) had been diving with his partner for years knowing he was not certified, (2) provided him tanks, (3) failed to follow the buddy system and (4) did not go back under water to search and waited an hour to call for emergency assistance, he was not responsible for his buddy’s death.
The second one focuses on another case that was also covered in the previous document and does not support your case.
You still have not provided a single example of a randomly assigned buddy being sued, successfully or unsuccessfully.
If the second article had been submitted to me while I was teaching how to write research papers, I would have found it very deficient. It is clear that the author was desperately trying to prove that dive buddies are at serious risk for liability in a diving accident but could not make the evidence support it. Part of the article is devoted to trying to explain why the evidence does not support it despite the opinion that it should. You will find the same thing in that first document you cited--the author tries to explain why there isn't much evidence to support the thesis.