Pending state usually means that the APs have not yet been approved. If you view the 'new devices' on the top header bar, does the number of devices there represent the APs on all the WiSMs? If it's anything other than '0' then it means that the APs are waiting to be approved / sorted into proper group/folders. This is most often due to users wanted to separate their APs by location.
Groups should be for any devices utilizing the same config template.
Folders should be for visibility and reporting.
For example, I might have Groups for California, Texas, New York.
Then in folders, I might go even more granular to separate San Francisco and Los Angeles offices.