WOW! that is so long that I am not even going to start to read it. My head will hurt
I will state my opinion on this topic very simply and to the point. You can take whoever you rank as the greatest boxer of all time from any weight class and put him in the ring under full Mixed Martial Arts rules against whoever you rank the greatest MMA guy of all time at the same weight class and the MMA fighter will win.
Now change that to a boxing ring, under boxing rules and the boxer takes it.
It is that simple. In my humble opinion.