I cannot help but feel he got himself sacked on purpose, he has said stupid shit to the press before but this was another level. My guess is he knew a new manager would be coming in the summer and he decided to walk before then rather than deal with this mess anymore.
I think the good results when playing four at the back then switching to three and it not working again underline how little of a shit he gave at the end.
He clearly wants to be a manager and not a coach, and he is never getting that at any of the biggest clubs in Europe even outside of Uniteds messy and dysfunctional setup. His appalling results at United mean he would struggle to get an interview with them.
I cannot help but feel that the current league position of 6th is because other teams have been worse, last ten games they have three wins, two losses and the rest draws, hardly world beating stats.