the deva starts out attacking, but then the closest man unit is an air elemental on your right side, so the deva tries to go for it, and by then is surrounded by all her celestial guards (who should be blessed, btw, if only for the morale boost).
With someone who has so many defenses, surrounding your pretender w/ such large and easily killable (prot 4) troops is counter-productive, as they get in the way, prevent the deva from aborbing attacks, and just generally will get killed.
also, give the deva some lightning resist if fighting Man
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I wasn't aware that draconians can fly in storms... that almost makes them potentially useful in some niche manner ;p