The Vertebreaker and Gringo Killer are the exact same move, a back to back double underhook piledriver. The only difference is how the move is set up, Homicide takes a little more time to set his up than Helms did in WCW.
Diving Leg Drop, Neckbreaker 1 (secondary finisher) , or RKO (OVW finisher)
Spinning Kick (Johnny Go Round), Lionsault (Springboard Moonsault), Superkick
Edgecution (Angel Wings), Neckbreaker 1 (Last Rites), Moonsault 2 (BME, use as a normal move)
Complete Shot or Cool Shot (Shellshock), Ninja (Sliced Bread #2)
Whisper In The Wind(Halo), Flying Neckreaker(Moorgasm), or Twist of Fate