I'ts dumb to compare Reyes' 2-round back peddling to Silva and Mayweather. Just stop!
Why does it matter who it is? Moving backwards is moving backwards.
It's just another way to fight. Hit and don't get hit is the name of the game. As long as you are doing that, you are fighting well.
Forward, backward, sideways, doesn't matter how you move. All that matters is that you hit and don't get hit.