Veiled threats, aside, the winner will be known...but only when decided upon by Fate. All any of us are are agents of Fate.
Pretty sure with this challenge, when there's a winner it will be over how the others have forgotten.
As such, the winner won't be known except potentially to the winner.
Preeeeeecisely. So a contingent question: "When a person is the only witness to their victory, how valid is it?"