When you have sixteen routes passing through one stop, it might be time to rethink your approach to station/interchange design.
I do note that the current TfL “Buses from Elephant & Castle” spider map (external PDF link) shows this interchange with a geographical street map – a huge improvement which also has the advantage of showing you exactly where each bus stand is (there are eighteen!) and which buses stop at them.
Source: Mach V/Flickr