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Hovis
Those two red pieces below sit either side of the cleat with SPDs and rest on the pedal on the 'flats' either side of the cleat mechanism itself. These 'flats' are the silver coloured bits on this XTR pedal:
These are the bits that actually take the weight of the shoe/your power on the pedal - the cleat and 'locking system' do just that - hold the pedals in place, but they don't take the weight/power.
If those red bits get worn they won't reach the flats properly, and your shoe can rock about. Scheritt was able to rock mine side to side to quite a scary degree. The rubber/plastic bits didn't reach the flats.
If those bits are worn out your shoes are not sitting properly on the pedal and aside from reduced power transfer there are potentially other issues - I went to him because I fucked my knee riding a 300 audax fixed but this could have been a contributory factor.
Make sense?