“Narcos: Mexico” exploded onto Netflix with cartel kingpin Felix Gallardo (Diego Luna) taking center stage in this intense, violent, multi-layered drama.It’s back, finally, minus Luna but with Scoot McNairy (and his dodgy mustache) returning as DEA agent Walt Breslin, still fighting the good fight while facing off against old and new cartel enemies as “Narcos: Mexico” doesn’t miss a beat in its third and final season.There are a lot of moving parts here as Season 3 kicks off.