Interesting, detailed analysis Patriotman. I think I'll avoid situations where CQB is necessary. For long term survival, in a SHTF situation, lying low and out of sight would drastically improve your chances. I would think that laying siege long term would be preferable to breaching and clearing a structure.
What about the use of distractions or force multipliers, like smoke, tear gas, and flash bang grenades? I guess if I was forced into a CQB situation, I would be looking for a way to improve my chance of success. Anyways, thanks for report!