What kind of a Prem job could he walk into? Managing a Scottish side arguably limits his next step to a midtable Prem side i.e. one outside the top 7. Even with his stock at an all time low, he could probably manage one of those right now. Taking a job at a Villa and Newcastle would allow him to complete his rehabilitation for a top 7 job sooner, assuming, of course, he's successful. Celtic would be a glorified sabbatical - perhaps his confidence needs it.