Similar to RJJ vs FMJ thread, if of similar weight/class. How about current Canelo and Marquez, with all their abilities and experiences, just the same weight/class.
JMM fights at a much higher pace than Canelo, has power appropriate to the weight classes he fought in and throws more beautiful combinations. He has a bigger set of nuts and is so tough, he drinks his own pee. He can be knocked down but can't be kept down. He's like a Walking Dead Chilango Chuck Norris or something. How tf is ginger boy gonna' compete with that?!