Aggree with the first paragraph. I still believe that sam moves his head and upper body more than pbf. Floyd uses the shoulder roll more in my oppinion. Anyway, I also agree with your third point that cotto does sit down on his punches more when his is throwing combos, but when he does square up and throw, they are usualy short compact punches, with his chin tucked and shoulders up, therefor providing him with enough cover to not really get caught with anything devestating. Lujan needs that head movement because he throws wide looping shots that leave him open to counters.
Just like to say that I am extremely impressed at how this thread swayed from becoming a ***** fight to an intelligent debate. Thanks for coming around guys. :good