Isnt he dead? I thought all the clones but Jessica turned into goo?
Miles Morales doesn't just have to fight Ultimate versions of Spider-Man villains, they could introduce Ultimate versions of non Spidey villains for Miles to fight.
Two villains I DON'T think he should face are Norman (even though he absolutely will, which is depressing) and Venom. The former is done, there's nothing more he can bring to a USM book. The latter is too personally connected to Peter to carry anywhere near the same impact with Miles. Maybe an army of mass-produced Stage 2 "suits" would have been a big thing for Peter (creating very personal anguish to see the perverted version of his dad's life's work that the man died to prevent existing being produced en masse), but for Miles, it's a bit of a moot point.