I was under the impression that Mitchell left because Levy and the board kept ignoring Poch and Mitchell's suggestions of which players to buy. Poch was very disappointed that Mitchell left
Tottenham’s head of recruitment quits after dream job turns into nightmare
Paul Mitchell has resigned from his post as Tottenham Hotspur’s head of recruitment after he felt his dream job turn into a nightmarewww.google.com
We will never know unless Mitchell actually divulges it, but there have been conflicting stories. What I definitely didn't buy into was that he left because of Levy being a "tight cunt" it's not like he was working with bigger budgets at Southampton and subsequently at RBL. I can't believe he left because he thought Spurs were suddenly going to start spending like City. And post Mitchell, Poch insisted on us not hiring a replacement or DOF.
As recently as thursday 18 June this year on the ESPN FC podcast, Gab Marcotti and Julien Laurens were talking about Mitchell's move to Monaco and Marcotti said the Mitchell had fallen out with Pochettino.