From what I can tell, they are not all essential anyway. There is a five man squad that can have one or both characters attached to it. They fall under Troops and HQ respectively so this forms a neat little allied unit for any other Imperial Army. The remaining models can be used as characters elsewhere, including plastic alternatives to Khan and Shrike. Granted they're not the most balanced unit internally, but they are not without uses.
Nonsense is our Salvation