Chiron marks a wound carried into this life -- often something that cannot be fully healed in the conventional sense, but instead becomes, over time, the very source of a person's capacity to help others through similar pain.
Note: Chiron falls entirely outside the Bailey/DK esoteric system -- it wasn't discovered until 1977. Read at the soul level as interpretive extension rather than sourced doctrine: the wound Chiron marks is not accidental but chosen at a soul level, a specific edge of unresolved experience the incarnation was designed to work at directly.
Read at the Hierarchical level as interpretive extension: Chiron's placement may point toward a specific form of service to others -- the 'wounded healer' function, where mastery comes not from avoiding the wound but from the particular wisdom only that wound could produce.