There's a David Frost-Brian Clough interview on You Tube where Clough admits that he would never have taken the Brighton job if the had known that the Man City job would suddenly have become available (I'm assuming this was the Johnny Hart resignation)
However, I've just finished I BELIEVE IN MIRACLES, and Forest also enjoyed some extraordinary good fortune to get promoted in the first place (not least an abandoned game which they were losing against Southampton.
Irunically, it also describes how quickly Clough realised that signing Asa Hartford was a mistake.
As for Big Mal, I think people forget that we were driving towards mediocrity before he returned.
Of course there were lots of mistakes, but John Bond selling Palmer Bennett, and Mackenzie were equally poor decisions, plus the way he treated Clive Wilson.