Ahh of Course. You're both right. Its only possible to prepare for one scenario, for one likely line up and for one set of tactics and players. During the game or even when the teams are announced an hour before kick off it is completely impossible to adapt your tactics and strategies to fit any unexpected changes. I'm stunned mangers haven't worked this out yet. Make one unexpected change every week to completely fool the opposition as they won't be tactically aware, prepared or able to adapt their tactics whatsoever. It is a guaranteed way to win every week. It worked so well for us when Mayuka ran riot against Sunderland, based on previous team selection they'd have had no idea he was playing or how to deal with him.