Clough - if for no other reason than there is a whole bunch of stuff on Youtube, and a lot which is quotable. Sadly I couldn't find my favourite, about my favourite footballer of all time, John Robertson - 'short, fat, smokes twenty a day - the perfect winger'.
Clough didn't just do the impossible, he did it time and again. Taking Derby to the League Championship, and then Nottingham Forest, and then, incredibly, winning the European Cup twice. And without having training sessions. With a centreforward he found playing in a park. Making the players have a drink before the game. He'll never happen again. And, sadly, Armstrong just might...