Quath |
You appear to be mixing terms here. Weapon Focus only applies to a single type of weapon (Longbow, Longsword, Greatsword, Sap, etc.) A weapon group is clusters of weapons as detailed in the Fighter Weapon Training.
Does that clear things up for you?
Lincoln Hills |
Note that the multiple lists should not be a reason for undue stress. As far as I know, nothing was changed... just expanded: weapons that first appeared in later books were simply added to the existing categories. So in the absence of Ultimate Combat or Ultimate Equipment, you can use the list under Fighter without worry.