HI Stuart,
I haven't looked at the gutterfighting web site, but in thinking about battlefield combatives, focusing on blows is the wrong way to go in my opinion. Note, I said "focusing" - Blows absolutely need to be incorporated into training... but put a guy in uniform, strap on his gear, elbow/knee pads, some tactical gloves, a helmet, gear strapped to his legs... and your target areas for effective blows get more and more limited.
Kicks are useful, but then you are in terrain that is likely to be rough and difficult at best so kicks may not be as readily useful as they are on a gymn floor or flat clear ground.
If I end up in a battlefiled fight and my opponent wants to try to pummel me.. I'll be in good fortune as he will most assuredly give me time for the following options: 1- draw my side arm (using the proper techniqes to prevent it from being grabbed) 2- draw a knife or machete 3- shoot him with my primary weapon 4- Beat him to death with the butt of my rifle 5- maintain position and call for help.. first guy who has a friend with a gun show up wins.
I still think that the guy who closes and grabs my helmet and snaps my neck (or totally control my head) with the assistance of the chin strap has a better chance against me than someone who wants to try to pummel me... the high collar of the body armor plus the helmet means he is likely to expend vast sums of energy and not get much payoff... meanwhile my friends are coming....
Lastly, the manual has been updated with the LONG VIEW in mind. Changing things in a 'culture' as large as the US military can be a very difficult task. This is a great step in the right direction. Combatives is getting more focus, but can only be done without taking huge sums of time from KEY training. The enemy has to get past the 'double taps' before he can use hand to hand on you. You are smarter to give marksmanship more time than h2h.
That's my 2 cents!

... or 102 cents...
Peace,
Tim