that will form the backbone of the other Successor armies (Makedonia, AS and Ptolemaia) in the later game as well as units like the Pheraspides or Hypaspistai.

Well, they should have pezis, hypas and pheraspidae, AFAIK, their recruitment is going to be fixed in 1.1. And Epeiros has something Makedonia isnt able to field: Thorakitai.