From the
FAQ first draft:
Q: If a result of 2-5 on the Destroyer weapon attack table inflicts D3 wounds, do these carry over to the unit if they overkill the model?
A: No.
While this only addresses the D3 wounds from a 2-5 Result, the same logic can be applied to the 6 result. Wounds do not carry over after the model hit by the D weapon is removed as a casualty.