Because that would be boring and he has already failed at this level recently.
Osian would be exciting as I'd genuinely love to see how he approached things. Who he had on his coaching staff etc considering his coaching links.
He's so well respected I would wonder what top managers would trust him with their young players.
It would be a breath of fresh air and exciting. How would he set up the team? How would he use colwill? It would all be fascinating.
It won't happen as that's not what cardiff city do so dreaming of days that will never be is all we can do I suppose.