let's say these three were rivals. who would own the others and why ?

let's look up to the qualities:

Tommy ''Karate'' Pitera:
-Karate Master
-Sadistic Killer/Disposer
-Pro. on Torture and Disposing
-Drug Dealer
-Had Samurai Discipline
-Never rat on any mobster
-Not so muscular

Salvatore ''Sammy The Bull'' Gravano:
-Practiced Boxing
-Muscular and Body Builder
-Ruthless Killer
-Pro. on construction business.
-Turned into informant
-Ambitious businessman
-Been in army (not in war)
-Skilled fighter

Thomas ''Tommy Two Guns'' DeSimmone:
-Psychopathic killer
-Got a lot to prove
-Complex and sudden
-Street thug
-Tall and muscular
-Works out with heavy bag on his own
-Careless about getting caught
-Carries two guns always
-Quick on guns

My opinion, The Bull would lose against the two; Tommy DeSimmone is far quick on guns and Tommy Karate would own Sammy in every possible match.

Karate would own Tommy DeSimmone too.