I think Guzman should be in the same bracket as Judah because he pissed away a major talent and lacked the necessary character.Shame,because he had thrilling potential. We'll never know how good Guzman could have been and this is way north of the weight I thought was natural to him so I have to pick Khan here.
Guzman could have been a borderline ATG like Marquez, but laziness and his weight issues took that potential away.
In his prime, Guzman is/was a much better fighter but now is probably too old, and too small for Khan.