So can Koshka and Grand'ma be separate units on the board or must they be used together with Koshka piloting? There is mention in the rules that she can board or disembark as she will, but nothing about her HAVING to pilot the walker. Also if the walker is destroyed does Koshka disembark and fight on her own. FURTHER, if she is piloting the vehicle are her points paid for with the vehicle or are her points added to the army total as if she were a separate unit?