I think Enrique's been dropped because; firstly I think Kenny has promised Kelly all the league cup games (a guess) and secondly; with Silva being out and Nasri having a niggle is safe to say Johnson was going to start and they took a hunch and guessed he would play on the right wing, when Johnson plays on the right wing he 99% of the time cuts in side and has a shot or crosses from deep, so playing Johnson on the right would cut A.Johnson on to G.Johnson's right foot for an easier tackle, rather than Enrique who's not as strong as Glen on his right foot. Just my personal opinion as to why Enrique has been dropped.