I'm no Tank fan, but he would absolutely beat the fuck outta Paz. You would need a better fighter than Paz to beat Davis.
I'd be shocked if Spadafora lasted more than 5 against Davis. Spaddy didn't have much footspeed, and his chin was dodgy. Davis would smoke him before the mid rounds.
Hold on here! Is Spazienza Pazienza or Spadafora? Davis isn't stopping Pazienza. It would be a horrible fight though. Pazienza would rush him, push him, lean on him, etc...There would be about 3 clean punches landed in the fight and I would be embarrassed for watching it before it claim to a conclusion. I would switch over to Buffy The Vampire Slayer and watch some good fights. If Spazienza is Spadafora, then Tank would beat him. Spadafora wasn't much of a fighter.