Okay, sorry.
Someone like Walker with his pace would definitely help.
Yeah, no question. Wan-Bissaka sadly seems far away from being positionally up to it. For example, I could see us going for Kounde (though Chelsea may well come back for him) or Timber, which is to say a speedy right-sided defender type and shaping up like this:
---Mason/Rashford---Cristiano-----------------------------
----------------------------------------Bruno------------Sancho
------------------------VDB/8----------------------------------------
Shaw------------------------DM----------------------------------
----------------------------------------------RCB/RB---------------
---------------Maguire----Varane------------------------------
-------------------------------De Gea------------------------------
Mancini probably won't be the manager, but this is how he played at the Euros since Italy don't really have a good attacking right back, with Chiesa as Sancho providing width so that the left-sided Insigne can come inside a lot more (suits Rashford and possibly Greenwood even on the left) , Di Lorenzo as Timber, Bruno as Barella on the right as the most attacking midfielder and a sitting DM and a #8 in a trio.
Though long-term you'd figure it's just a normal front 3 with Sancho and Rashford wide of a central Greenwood with Bruno on the right of a midfield 3 with a DM and someone on the left of the 3 (VDB, Pogba or a new player) and then a standard back 4 with Shaw at LB, Varane at RCB, Maguire/Lindelof or a new LCB and then a new right back unless the next manager really takes to and improves Wan-Bissaka or Dalot.
TLDR: Sancho and Shaw are our best wide players and Telles likes to attack too, so having them ensuring width and an unbalanced formation that allows Sancho to be higher up the pitch than the left-sided wide player (Shaw or Telles) seems logical enough and a way to get Sancho on the field providing assists to the front 2 without using him at wingback.