Difference is those four managers inherited a club in some form of crisis (one of them due to Davies' antics).
Davies inherited one of our best and most valuable squads in our history.
He is also the only one of the four to jump ship, so of course his win ratio will be higher.
Had Irvine jumped ship when West Brom came calling, Irvine would have the highest win ratio of the lot, having pulled us well clear of relegation, before getting us into the play-offs.
Either way quoting stats is missing the point - he doesn't like budgets, he can't work in a grown up manner with a chairman, and he deliberately tried to destroy our club, and for those reasons he isn't the right person for this job.
No he didn't. He inherited an average team. It was the signings he made of Nash, Hill, Sedgwick and most notably Nugent that turned us into a Play Off finalist team.