Delenn tells Aldous there are two castes in Minbari society-the Warrior Caste and the Religious Caste. No mention, at this time, is made of the Worker Caste, which would figure prominently in later story lines. The two castes were intended to represent Sinclair and Delenn; a third caste was added when Michael O'Hare departed the series and the character of Sheridan was inserted into the mythology.
After Aldous's first fight, when he talks to Jinxo his staff is resting on his shoulder when seen from in front but near his collar when seen from behind.