are you sure sumeragi is stupid? using that info is like setsuna saying he is a gundam maister... and not going to kill the terrorist contradicts the whole idea of CB.
i think that the three new gundams are part of CB, but are not in control of sumeragi, someone else's. and this someone just ordered them to save the 4 gundams as they werent going to destroy themselves... i still think yukimura was right, just that the 3 new suits know the real goals of CB, just like saji's sister said in chapter 14, and they are just using all the people we know of CB... and then CB gets divided in two groups...