With the height advantage khan wins on points. Brook has more power than khan and couldn't knock porter down.
Porter is a bull of a fighter and much stronger and more physical than Khan. I could see Khan being dragged into a war and stopped late.
Do you think Khan could keep Porter off him? He's struggled with lesser fighters and whilst Porter is crude he is like a little bull and he does have pop in his punches.
Brooks far bigger though I think he had a great style for porter, I was actually disappointed in brooks performance, people are really underestimatin porter these days too