#2 Tactics
Mourinho's tactics this season have come under huge scrutiny. Many pundits have stated that Mourinho may be trying to sabotage his own team in order to face the sack. His huge ego will not allow him to resign from the post.
This will be a sign that he indeed gave up on his ability to deliver which is something Mourinho cannot do. On several occasions this season, he has played Scott McTominay at center back when there were fit central defenders at his disposal.
His latest risk-taking tactics have proven the point of sabotage. Against Southampton, Mourinho switched to a 3-5-2 formation which isn't bad. Sometimes tactical switches are necessary. Who did Mourinho play as two of the three center backs? Eric Bailly? Chris Smalling? No, he played two holding midfielders in those positions.
McTominay and his favorite Nemanja Matic were deployed in those positions. Also, Marcus Rashford was having good game and was doing a lot of running to spark his team. Mourinho decided to bring him off instead of the error-filled Romelu Lukaku. It is only an injury scare that prompted him to substitute the Belgian.