Except Perch simply isn't good enough and we all know that Carroll playing with the same drive as yesterday can cause problems for any defence in the world.
James Mclean is a perfect example of being found out. The problem arises if you have a very one dimensional game, i.e. run in straight lines and twat in crosses. See Downing as further proof of this.
Cisse is by no means one dimensional.
Merson has no idea how difficult Cisse is to mark
West Brom's Olsson was on Radio 5 on Friday evening discussing why Cisse was so effective and he basically said that he was just utterly unpredictable. You don't know where he will stand or which way he will run.