Fight takes place in a New York Subway Station, Grifter does not have his telekinesis or telepathy, morals are off, all characters are bloodlusted, random encounter, win by death. Who would be the last man standing?
Deadpool kills everyone because he is a better fighter than all of them. He carries multiple firearms, explosives, and edged weapons, He also superhuman strength, speed, agility, and reflexes. Finally he has an INSANE healing factor meaning he can just soak up everything you have IF he hasn't dodged or countered it before hand. Comparing a GI Joe character to Deadpool is ridiculous but I have nothing against them I'm just using my vast knowledge of Deadpool to support my answer unlike you guys.