Here is an image clearly demonstrating that Trent hasn't learned from his "catastrophic" performance against Manchester United and that he is criminally unaware of players runs when balls are played in behind him.
His "slow learning process" ultimately costing us a penalty a necessitating the immediate return of Nathaniel Clyne into the line up, or even better, the ever reliable James Milner:
Oh wait no it doesn't.
While Trent could afford to be a couple of feet closer to Van Dijk, his overall postioning and awareness is fine, his body is open and angled to where he may need to run and he's ready to immediately break into a full sprint off his first stride to challenge Zaha for the ball.
In this situation he's actually in the best body position out all of our back line.
However a hilarious comedy of errors occur around him which I won't go into detail on, but involve Matip doing his best Lovren vs Lukaku impression, stepping out of the backline to fondle Benteke's backside, but then do nothing, only for Henderson to take over the bum fondling, just to literally stand and watch him head the ball. Karius's decision to challenge is also questionable.
There's very little he can do in that situation, he just loses a foot race.
But, I hear you cry, remember that one before hand where he ballsed it all up and Karius had to spare his blushes:
Except he didn't.
In this second situation he's unfortunately had to kill his momentum to hold a line that really shouldn't be stationary, given that there is a threat in behind and no pressure on the ball (Dick Bate does a quality session on this on youtube). However his positioning both on the pitch and with his body is fine and he's more than aware of the threat.
Believe me, as someone who grew up playing right back as I wasn't very good, Trent is more than aware of the threat in behind and is doing everything he's been taught to try and control the situation.
Ultimately, Trent is continually receiving blame for the mistakes of senior players around him. Won't go into too much detail but one glance at our midfield should be plenty to explain what went wrong.
I was going to go into a big explanation of everything that went wrong around him but I've seen Baba has done a tremendous and thorough job of that, so I won't bother.
But for the love of god lay off the kid.