I see what Marcus was getting at in the philosophical sense & it's very true in the abstract. However, there are indisputable & objective facts that can be agreed upon by multiple observers who are being truthful. Their opinions & perspectives on those objective facts will differ, however. That is true.
Saying if Everybody's name was John, Somebody's was Jade, Anybody was Rose and finally Nobody was Dave. John thought Jade would do it. Rose could have, but she did not. Dave did the job even though it was Jade's job!