Clap trap! It may not be a guarantee of future success but past success surely can demonstrate competence, especially when it is pretty constant.
If you really feel that his only real success was at derby then you need your head testing.
He inherited a fine squad at Preston but managed to add to it very well and instill discipline, both tactically and in particular, off the field, where Craig Brown could not. We made the play offs twice in a row with some fantastic displays and showing the opposition no respect.
He left for a Detby team in disarray and turned them around again adding shrewdly to the playing staff. Promotion followed.
Then he was appointed at Forest and completely turned them around from near relegation to two play off campaigns. What has happened to all clubs since pretty much shows what they are missing.
He is a superb manager. I'd be much happier if he were to return, than crossing my fingers that a rookie might turn out good.
What we have a deepdale is a squad full of youth, inexperience and a distinct lack of quality. They need a leader of men in charge. Billy is that man.