Evolution in the engine room: the midfield battle between Real Madrid and Barcelona

The midfields of both Real Madrid and Barcelona are beginning to resemble Japanese trains at rush hour. If Jose Mourinho and Pep Guardiola continue to pack more and more players in, it is likely they will struggle to keep each one happy and in form. Something has to give. So who will survive the cull, and who will earn starting midfield berths in 2011-12?