It would be cagey as hell. Two very accurate counter punchers with great timing, footwork and high ring IQ although you'd have to give JMM the nod in that regard. Hard to pick a winner.
Bring him over to the UK, random blood and urine testing from the day the fight is signed, ban Herredia from entering the UK for being a known steriod dealer and jobs a good'un.
Brook by wide UD or late premature KO with Dave Paris the ref. Good fight for Brook he is the first true Welter Juan Manuel would have faced. Marquez would get mullered
Amazing Marquez is being mentioned, he was supposed to fight another INGLE fighter at Feather more than 10 years ago NAZ lol
Kell may have a beaten a juiced fighter in Porter. As a champion, he needs to force Whine Manuel into taking more stringent testing. We all know JMM is on that juice.