Looks like he can slowly build a club up bringing in workman-like cart horses and getting the best out of them, but can't manage pampered thoroughbred race horses, it probably takes a different style of management.
I know someone will say Southampton players are hardly race horses, but they are in comparison to a battling Luton, different players with different abilities and attitudes, the "it's my way of the highway" style doesn't work in the premiership the players just get you the sack.