Personally, I don't care for any of the positions where the pistol is too close to the body. For one it's a lot easier to have your arm held against you and be pushed over. Secondly, engaging multiple attackers requires evasion and tactics, firing from a weakened position isn't going to help matters. Third, people have a tendency, regardless of training, to put there strong hand between them and their opponent. Last, defending against an edged weapon from that position means you are actively standing your ground and weakening your defense by leaving only one hand open.
I'm a firm believer that drawing a gun at such distances is going to turn into a fight over the weapon, and open hand skills have more use until you can gain a higher ground, so to speak.
"Today is victory over yourself of yesterday; tomorrow is your victory over lesser men." - Miyamoto Musashi
[Insert random irrelevant religious quote here]