He'll end up out of the job if he persists with this system.
Thing is there's other teams in the league who work a 3 / 5 at the back well.
The keys are
1 - the full backs get up and down which allows the attackers to get narrow and into the box
2 - the centre midfielders get up and down fast.
Maybe two or three times Myko and Patterson got ahead of McNeil / Gray today.
Iwobi and Doucoure just are not getting up the pitch quick enough, Iwobi has been doing alright but he's usually with the ball. Neither of them get into the box to cause problems though.