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Canon is a basic premise, a convention for ease of perception, and not something to be strictly adhered to. You can create a race of humans in a classic medieval setting, but develop the characters in such a way that even Blizzard would be envious. The customs and orders are not so important. These are the starting parameters, the basis from which any story originates. But what makes it interesting is the ability to creatively reinterpret familiar elements in an unconventional way.
It's better to ride a bird than to put it on your head. I understand that it's patriotic, noble, and all that... But such embellishments are more indicative of an inflated ego than any special mission of the unit.

This rider definitely looks cooler than the one above.
Or, for example, consider a
neutral human warrior. There are no obvious inconsistencies, and it looks quite decent:

Although, the cavalry in Heroes 6 (
http://might-and-magic.ubi.com/heroes-6/en-GB/game/creatures/haven/index.aspx#tcm2111290-Maintab-7) are drawn quite well.