This is how Khan V Rios would play out, Rios will just keep walking towards Khan in straight lines and Khan will shorten his punches and land combinations and Rios will get stopped by the half way mark.
Watch the video, Rios, Will keep walking forward like that because he thinks he has Margarito chin and power except he will be taking fast combinations from Khan and Rios will look like a C class fighter.
I could see Khan winning an exciting UD, with a score like 115-111, with Rios flooring Khan once in the late rounds.
We don't know how Rios will perform at 140, he could be slower, and/or have more stamina and a better chin if he really is having a hard time making 135.
Rios aint no faded Gomez. Rios would of destroyed that version of Khan within 2 rounds.
That Khan was 3+ years ago even then he was super talented, Now its a different story, He is better than ever and keeps improving.
Even that 3 year old Khan would UD Rios if not stop him, Today, Khan would absolutely pulverize Rios and get a stoppage.