100% of races are paired with a personality. Some races are better/more viable when compatible personalities are op. In the case of avian, the better cleric is the better they will be.
in top play the large WW bonuses you get serves as a permanent nerf to avian(since an avian core always assured you an extra wave in min time wd). Everywhere else they are many times the best race at being a situational a/t/m while still being very strong attacking core.