Yeah I’ve seen all the games, the full backs move inside to create overloads when appropriate however it was clearly not appropriate at that stage. In that instance Dalot is the only player available for a simple pass who would not be pressed by the time the ball arrives at his feet which is why Maguire is telling him to move wide to take the pass. Martinez is not unmarked, by the time the ball arrives at him their striker would be on him. The video you’ve shown quite literally demonstrates those points although it conveniently cuts out the couple of seconds before where he was clearly telling Dalot to move.
I would call you lying if you said you watch our games and argue the appropriation.
If Sancho or any rotated attacker in wide attacker doesn't keep the width, then Dalot would move wide. If Sancho does, Dalot would then tuck in like a side midfielder. Dalot would move inward as to pull opposition marker inside creating angle for the pass to Sancho. Same pattern with Timber, Marzouri, Antony for Ajax for those you watched them play last season.
It's automatism, a pattern of play. If Maguire doesn't feel like that options, he can easily just stay where he was and pass to Martinez then Shaw and build from that side. Here Maguire pushed forward for his own unknown reason cutting all his passing angle. Quite a few example of this pattern of play in this Maguire vs Palace video. Just pay attention to Dalot, Sancho when Maguire's on ball.
There is no pressure on Maguire at all when he received the pass. Dalot is one of multiple options. Martinez, Shaw have always been an option. Sancho for a medium range, too.
I posted 2 video link. I am well aware of the first video link with the hand signal in the first.
The second video with a wider view is taken from broadcaster's edit. No agenda poster having time to conveniently edit that the video that stupidly. It means to showcase Sancho was in staying wide mode, so Dalot logically followed the playbook and tuck in.
Edit:
Playing out of the back with CB as ball carrier pattern of play.
Mechanism behind it: when fullback stay wide, then attacker and midfielder tuck in. Vice versa, full back tuck in then attacker or midfielder stay wide.
Example:
Applied to both wings at the same time even in some occasions
Tucked-in players are not always supposed to be good passing option. They may just be decoy. The idea is to isolate opposition defender against our width provider.
Safety measurement: If you don't use width option, and all the tucked-in option is well marked; choose easy option like passing back to GK, or kick long as pointed out in post match by ETH & DDG himself regarding DDG mistake on second goal against Brentford.