IIRC, the Container system doesn't work for rigging, as the Container acts essentially as a single item. You can't bind the bones in a Container to the Skin. We mentioned this problem to Autodesk in their last visit, so they're aware of it. Maybe it will change some day. I have heard that Maya has much better support for…
I still use it at work for interior/exterior scenes connections, 2012. Maybe not perfect but I didn't take the time yet to see the containers and it does the job I want.