I think everything you say is true but would a high knockout value give some insurrance if it goes wrong?.
Was it not said "you should use a caliber that will work when everything goes wrong,not when it all goes right".

I love my 404j, if and when I get to take an Elephant I will use it even though it rates poorly in TKO table.The biggest question for me will be 450 grain solids or 400 grain Hydro's?.