We've only got one Song?

David Sullivan has told the Evening Standard that West Ham have not given up hope of signing Alex Song for £5m from Barcelona. More than any other player Song seems to sum up the enigma of last season. He was absolutely brilliant before Christmas but then went from eight or nine out of ten performances to five out of ten. Was he carrying an injury? Had he fallen out with Big Sam? Was he disengaged because he wasn't going to move permanently? Is he such a confidence player that he was affected by the decline in form around him? Can anyone explain why his form slumped so badly? I'd take the player from before Christmas, though not the one in his later days at WHU.