Marco Silva took over a side which hadn't kept a clean sheet in 18 games last season, and kept 2 in his first 3 matches in charge - against Liverpool and Manchester United - while Allardyce took over a side which had gone just 3 games since its last clean sheet, failed to keep one in his first 5 games and only picked up 4 points from his first 8 games. Silva has also managed to keep 5 clean sheets in 13 games with Watford, who only kept 7 in the whole of last season. But Silva is seen as a liability and Fat Sam as a guarantee of survival and defensive stability. You're being hoodwinked.