The theory is that if you're on first you are less memorable than someone on last.....and looking at who was in the bottom 2 each week that theory had some truth.
What seemed to be really unfair was the running order after diana's 'illness', when in the 3 weeks that followed she went on last but one twice and last. The week ruth went, ruth was on first, yet the week before she had been on second. Don't see how this could have been fair, especially with the close call in the voting.
Good point too......JLS haven't opened yet at all!!