Aileen I think it's perfectly possible that ego was a factor. And in some ways I don't blame Dani too much for that. Having played second fiddle for so long I guess he felt he was ready to be first violin and that's exactly what he now is with FF. But that doesn't mean it would have been right for Andy for him to play that role with him - I just don't think he could have given Andy what he needed. And Andy is usually pretty astute at working out what he needs from his team at any particular point in time.
I don't blame Dani either. Apart from anything else there must be a limit as to how long anyone is content to play second fiddle, if they have any ambitions at all that is, and so in a way the decision to employ Amelie probably helped rather than hindered him. Also we don't know if Dani might have gone even sooner given the right opportunity, unless he felt it would be disloyal to leave Andy before the end of the season. Berdych had been looking for a coach for ages, so it would be interesting to know who approached who and when because when the announcement came it was swift and certain, as if the deal had already been signed and sealed. I think Dani could well go on to have a successful career in coaching since it seems fairly obvious that that's what he wants.