Alexander's youth & speed are hard to overlook. Devon has all the advantages over Marquez. (Except experience) bad styles match-up for JMM. (Personaly Id rather watch JMM Vs. Bradley) If I had to pick obviously I'd root for my dude, JMM But...
If JMM really wants that 4th title, his best shot is to aim for for Alexander. It'll be a difficult fight, but stylistically he'll be more successful than he will against Khan. I'm not sure if Schaefer will allow this though.