The entire problem starts from when Maguire doesn't win the ball and leaves a massive gap which then causes our defence to panic when the ball is played into the space he's vacated; Varane did exactly the same a few weeks back but i forget who against so it's not about agendas or whatever. Dalot has NO help whatsoever from any of his teammates be it Elanga tracking back or a defensive midfielder plugging the gaps, and if he goes to the eventual goalscorer he's leaving the center completely vacant for two other oppo players to get a tap in.
By the way, I have zero attachment to Dalot as a player, i don't think he's good enough and i'm not sure Telles is either but i felt sorry for the kid with that goal. The mistake starts with Maguire.