No, Warnock has only ever managed sides destined to struggle when he's had teams in the top flight, but his record is poor. On the other hand, Guardiola has never had to "slum it" in his managerial career. There may not be any evidence that he would succeed at a club like Bury, or even Cardiff, but there's none that he'd fail either - if he suddenly says in a couple of months time that he's enjoyed his time at Man City, but he really came to the UK to manage Cardiff, I'd risk telling Warnock thank you and goodbye and take a punt on Pep.