Oh yeah, that would be my key reservation at someone like Schumacher or a lower league manager, Moyes did a good 4 years at Preston before being 'ready' for us. Obviously times have changed since then and managers with 12-18 good months tend to get snapped up quicker, which doesn't allow them time to learn at there original club etc.
Nathan Jones was also the most intense man in the world, and his logics only seemed to work at Luton but not at Stoke or Southampton. I think if you asked Luton fans also, they wouldn't swap him back for Edwards