Finding fights where one person isn't the issue is not proving that it's always the case.

Finding fights where one person can be the issue and cause the wipe is, on the other hand, proving that very point.

Assuming the four points you described above are all met. And yet one person fails to apply it, either by lack of skill, tunnel vision, or simply because that person lied ? isn't that person at fault ?


take coil T9 for instance, imagine a person constantly fails to place meteors and put them too close to others, leading to an intant wipe. This is a case where a single person can cause a wipe.
Take Exdeath now, savage version, one dps is overwhelmed by the mecanics and just fails to provide the expected DPS to clear it before enrage. No death, no fails at mecanics, but the dps requirement isn't met, leading to constant wipes over and over. This is again a case where a single person can cause a wipe.

And I coudl go on and on.