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What about the Ravagers? And the Jaguar Warriors? The fact that they wear leopard skins instead of clothes doesn't separate them from the other orcs ;).
Aztec orcs? Sounds interesting. The only thing I didn't really like about this faction is the excessive muscularity. Orc bodybuilders, ugh :D.
Regarding the alt-upgrade: it was only added in "Heroes V". So "Heroes" just took a step back :rolleyes:. I also disagree with the idea that the unupgraded creature is too similar to the upgraded one. The Dream Stealers have a different color scheme, a heavier staff, and more clothes :D. Other units differ in a similar way. And how else should they differ graphically?