So imagine a guy getting his ribs broken by kick after kick from outside of punching range? Or imagine a guy mounted with punches raining down after the first take down attempt of the fight? How exactly do you propose a boxer would have done in that fight?
Cung Le and Scott Smith are not two of the best MMA fighter's in their division. Not even close. The fact that you assume they are tells me your not equipped to handle this discussion.
Melendez is a top 10 LW, Thompson not so much. I digress, its ******ed to take a 10 second clip of a bout between two fighters and say "look at what a boxer could do here". Surely if Melendez was fighting a world class boxer, he would be more apt to utilize his grappling rather than his stand up, wouldn't you think?