Wingman: the guy who takes one for the team, he takes away the obstacles for you to hit the target. he builds you up and makes you to seem better and cooler.
Friend: a guy you happen to go somewhere with and you both walk up to a set and start gaming. he does not build you up or elimintate obstacles, he is there for himself. he competes with you for the target.
and as for your idea of having a friend for DHV. uh.... there is a high possibility your date will become attracted to him instead.
good luck man

keep sargin