Only 5 FBs (RB, RWB, LB, LWB) have more assists than AWB in PL.
TAA - 12
Robertson - 8
Digne - 6
Azpi - 5
Aurier - 5
AWB - 4
Among RBs and RWBs, only TAA and Aurier have more assists than AWB. (I think Azpi has 1 from LB position).
the question is how many from those TAA's assists were made from the open play ?
I know that he got them plenty but if you have player like Sancho, Maddison, Grealish etc in England squad who also manage to got few from set pieces is it really needed to have your rb to take them ? I mean is his delivery much better than theirs compered to how much better in defence Wan Bissaka is to Trent ?
also having someone like Bruno in United to take them does anyone would swap Aaron for Trent?
in his last 8 games Trent got 2 assists against WHU, Wan Bissaka got 3 in last 7 games.
also if you're playing behind someone like James who is not cutting inside and trying to go to the corner flag and cross it himself gives you less oportunities than playing behind Salah who is almost always around the penalty area and you have that right side all along for yourself.
Just look at our last 2 games having Greenwood in front of him who is playing in similar areas like Salah, Wan Bissaka got 2 assists. He is waiting 15-25 metres away from goalline and when James is playing he is waiting 15 meters closer to the halfline.