It's all speculation, I thought Hoffa's remains would be found when they cleared away the wreckage of the World Trade Center.
I haven't seen The Irishman yet, Hoffa is a classic example of power corrupting absolutely. Sheeran could have done it but Hoffa made numerous enemies. Other suspects are Philadelphia mob boss Russel Bufelino (Pesci) or Genovese underboss and head of that family's NJ faction Anthony "The Pro" Provenzano.
I haven't seen The Irishman yet, Hoffa is a classic example of power corrupting absolutely. Sheeran could have done it but Hoffa made numerous enemies. Other suspects are Philadelphia mob boss Russel Bufelino (Pesci) or Genovese underboss and head of that family's NJ faction Anthony "The Pro" Provenzano.