I don't think Pearson is a mentally well man. I've thought it for years. He always seems to be on the edge of a psychotic breakdown, as if the job has too much pressure for him. He was almost certifiable towards the end of his Leicester days, and he hasn't improved.
To me, he would have been better suited as an officer in a youth offender's jail rather than a football manager. In fact he reminds me of a true-to-life Biff Tannen, from the 'Back To The Future' films.