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Okay, Roma...
Then why Summoning for Humans?
And why not Light for Dwarves, but rather Summoning...
Well, Chaos doesn't suit Humans (if someone thinks it does, they should justify it), and Darkness in a city where they worship a dragon of light also looks a bit out of place (if I'm not mistaken, in later parts of Heroes, Darkness is not available to them at all, especially in Heroes 7, if nothing has changed there). So, Light and Summoning (and even Summoning has various celestial shields) - Summoning clearly suits them better than Darkness (Elrath wouldn't approve of studying Darkness:D, they are all fanatics of the Church of Light).
Added 5 minutes later
Ah yes, and Dwarves: Chaos-Summoning is already with the Mages, and Chaos-Light is not used by anyone, which is why it suits Dwarves, besides, it's Light for them in the original game.
Added 8 minutes later
Too much Summoning, you can easily give Mages ANY other magic instead.
From the proposed options:
Darkness-Chaos:-----------Inferno---------Dungeon-----
Light-Summoning:----------Humans---------Sylvan--
Chaos-Summoning:--------Academy---------------------
Darkness-Summoning---------Necropolis--------------------
Chaos-Light:--------Fortress----------------
we see:
- Summoning 4 times
- Chaos 4 times
- Darkness 3 times
- Light 3 times
so Summoning is not more frequent than Chaos
