By using the word efficient and not effective one must assume costs. The following link is from an article by Lt. Colonel Melton which has been before, but is now about five years old, but I think it still applies and might very well be the adjustments the general is talking about:

http://usacac.army.mil/CAC/milreview...g05/melton.pdf

Here is another article I came across:

http://www.dtic.mil/cgi-bin/GetTRDoc...c=GetTRDoc.pdf

For those who don't have time to read and are unfamilar with Lt. Colonel Melton, he argued in his article that the small BCTs had caused the Army to have to create additional types of BCTs, which increased overhead. He recommened combining BCTs, attaching FA battalions to BCTs even if the FA battalion is not firing in support of the BCT, establishing an engineer hqs in the BCT, combining sustainment and maneuver brigades (which may have already been done - combat support brigades), BGs command BCTs.