In the OP, I said the top tier should be prosecuted. But there isn't any reason to not prosecute others, if an investigation indicates that they were involved in illegal activity.

The general pattern in prosecuting "organized crime" is to start at the lower levels, flip people, and work up to the top. Unfortunately, in the political realm, recent history (Nixon-Watergate, and Reagan/Bush-Iran/Contra) it has been lower-level people, and some near the top, but never the president.

Because there is ample evidence against Cheney-Bush -- and those on the next tier -- it would seem important to focus attention on the .....as their positions allowed them the ability to order others to commit crimes. But your point is well-taken; I definitely agree.