That's exactly why we've signed just Cech this window. There's no point in buying unless the new player is better than what you already have. Casillas had amazing diving, anticipation, reflexes and a bullet throw, which made up for his lack of height and poor handling. Casillas was also the king of one on ones! Navas has a decent kicking distance for his height and top quality reflexes. He can't catch to save his life and parrys the ball into opposition strikers. He also isn't the best at commanding his area. He's a capable keeper though, however he is a noticeable step down on De Gea.