useless fight for Pac. If he looks good against Rios then he needs a rematch with MArquez or another big name fight. Battering Khan will do nothing for him.
If he KO's Rios he should fight whoever is the winner of JMM-Bradley, try another fight against Floyd, then whatever the result of the negotiations, just ride into the sunset with a solid resume and impressive titles that will never be eclipsed again for generations.