Heroes 5.5 WarGame Edition - Tactical Edition.

Leadership suits humans perfectly; even the racial perk, Prayer, increases morale.
The demons' racial ability is actually directly tied to logistics (the method of delivering troops to the battlefield), although not in a gameplay sense.

Well, in my opinion, Prayer is more suitable for light magic if it's still Prayer - I, for example, renamed Prayer to "Heroism" and assigned it to Leadership (while the Orcs had to remove "Warchief's Command" because there wasn't enough space in the Orcish spellbook, and Warchief's Command is almost a duplicate of Inspiration).
I understand that the Humans' special ability has changed - wasn't there a guardian angel?

Added 1 minute ago
You convinced me about the demons - I actually immediately thought that you would explain it exactly like that :) (the connection between logistics and the hellgates).