Spectre, trust me when I say that I was not proposing to devise a new, complete system in 5 minutes.
Even if the release method I described works only against static attacks, it still greatly reduces the number of retention moves you need to remember and select from. And, I believe there is potentially much better integration with DT and firearms.
Also remember that bad/static grab attempts can quickly turn into aggressive/successful ones if you don't do something ASAP.
But in my opinion, the release method I described can work against fairly agressive wrist/gun grabs (at least in some of the FIST suit experiments I've tried). As with most self-defense techniques, best effectiveness occurs if you are aware and have a chance to act before the opponent really gets locked into his attack and you can move off the line of force. So the fact that someone is closing on you aggressively is not necessarily a problem, as long as you aren't taken by surprise and the guy is on you before you've even woken up to the fact you've been targeted. Since this is a drawn handgun retention method, I would hope that you are aware and not sleeping on the job!
If you do get bowled over by surprise, at least you still have two hands on your gun. You also still can execute the same circling release movement on the ground as well (but unfortunately probably with less torso torque and certainly without the benefit of dropping your center of gravity).
Try using can opener or nutcracker on the ground!
In fact, you probably can use the circling movement as part of the common martial arts ground escape from the mount. Presumably the attackers hands are already occupied by trying to take your gun. So his weight is probably well
forward. He has only his legs as a base. This should be very easy to buck him right off of you. Simultaneously roll to remove his hands from your gun.
Note that the standing release movement puts you in perfect position to deliver a followup elbow spear to the attacker. Your torso is cocked, your center of gravity is down, and your elbow is already in position. You just need to shuffle forward, raise up, and jab.
Also note that the upper torso torque and dropping of the center of gravity during the release itself all combine to aid the mechanical release.
If you see the charge coming in time, you can reverse drawstroke to retention and deliver a rising Thai elbow. That works to keep the opponent from ever getting near your drawn gun. This technique works for small people against large people. Again, I've used this in FIST suit experiments against opponents outweighing me by over 100 lbs. The attacker's forward direction adds power to your strike. You don't even have to actually strike. He spears himself. The key again is to step off the line of force, get into an aggressive braced stance, and deliver the Thai elbow.
None of this stuff is revolutionary or original. They all come from martial arts techniques that have been around for ages. The trick is merging empty hand techniques with firearms requirements, and also getting out of the classic martial arts mindset of having a specific, optimized move for every conceivable attack.
WH