Which of these characters would be the best teammate for Solid Snake in MGS4?

In Metal Gear Solid 4, Solid Snake is up against Liquid Ocelot and his army of PMC soldiers, cyborgs, and nanomachine-enhanced enemies. If you could add one of these characters to his team, who would be the best fit and why?

Chris Redfield (Resident Evil) – A tough soldier with insane strength and experience fighting bioweapons.

Adam Jensen (Deus Ex) – A cybernetically enhanced agent with stealth, hacking, and cloaking abilities.

Sam Fisher (Splinter Cell) – A master of espionage and stealth infiltration.

Ghost (Call of Duty) – A highly skilled special forces operator with tactical expertise.