What is your opion of these matches that never materialized ?

Throughout my years involved as a spectator of boxing, I have always wonder about the following matches, 1. Victor Galindez v. John Conteh, 2. Matthew Saad Muhummad v. Michael Spinks, 3. Eddie Mustafa Muhummad v. Dwight Muhummad Qawi, 4. Wilfred Benitez v. Pipino Cuevas, 5. Ayub Kalule v. Maurice Hope, 6. Sugar Ray Leonard v. Aaron Pryor, 7. Eusebio Pedroza v. Azumah Nelson, 8. Eusebio Pedroza v. Wilfredo Gomez, 9. Alexis Arguello v. Salvador Sanchez, 10. Alexis Arguello v. Eusebio Pedroza.....nuff said !!!!!