Remember that ability and training are associated with caliber used. Thus, for example, the very small number of shooters using an 0.32 may have good incapacitation numbers (other than failure to incapacitate) because users of unusual calibers are likely to be better trained and thus great shots, not because the 0.32 is better than other mouse guns.
It's hard to argue with the rifle/shotgun results, except that they have weaknesses for concealed carry. If you're going to defend your home though, the shotgun jumps to the top of my list. I wonder how many intruders are incapacitated by the sound of the pump action even before the trigger is pulled - that's got to be an effective psychological stop, even before you get the physical stop!