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Originally posted by: MeBeJedi
Interestingly enough, the novelization makes it clear that the Empire was under the control of Palp's Force abilities, which would explain its machine-like efficiency. After Palps is killed, the armies, which were too dependant on this control, fall into disarray, and are able to be overcome by the Republic forces. (A very similar concept was used for the droid armies in TPM.)

While the movie doesn't touch on this, you may notice that the Republic doesn't start kicking butt until after Palps is killed.

This is also reflected in the Zahn trilogy (cannot remember which book...think its the first). Palleon talks about the disarray at the Battle of Endor with Thrawn, and Thrawn suggests that it was the death of the Emperor that caused it...that he was subtly controlling all the various ranking officers through the Force. Palleon doesn't believe it, saying it was because they lost the Executor and the shield went down.

I think it was in context to why they need the C'Baoth clone...C'Baoth could control the crews of ships suffering from the double-blind effects of the Imperial Cloak, allowing greater coordination.