We are talking about filling shoes that are impossible to fill and the next person is going to have a very hard time being judged fairly. This makes me think this person is going to be a transitional coach simply filling a gap before the next coach can take the helm with more of a clean slate.
I know this is hardly comparable but after Pope John Paul II it was thought that the next Pope was never going to be revered in the way John Paul II was. So basically Pope Benedict more or less filled the gap creating a buffer before Francis arrived. More or less to take the church into the future without it being overly influenced by it's past.